docs: remove the proxy from the sdks overview table (#3060)

## What

This change removes the "unleash proxy" column from the SDK compat
table.

## Why

Because the proxy isn't technically an SDK. Having the column there can
be misleading to users.

In the latest case, a user pointed out that the table says the proxy
supports `isEnabled` with fallback values, but that there is no way to
use this via the API (or via client-side sdks) at the moment.

I think we should add a section to the proxy doc about its capabilities
instead.

In fact, I think we should do the same thing with the proxy that we did
with the SDKs: merge the docs.getunleash content with the github readme
and instead source it from there.

website/docs/reference/sdks/index.md

@@ -51,57 +51,57 @@ If you see an item marked with a ❌ that you would find useful, feel free to re
 
 :::
 
-| Capability | [Java](/docs/generated/sdks/server-side/java.md) | [Node.js](/docs/generated/sdks/server-side/node.md) | [Go](/docs/generated/sdks/server-side/go.md) | [Python](/docs/generated/sdks/server-side/python.md) | [Ruby](/docs/generated/sdks/server-side/ruby.md) | [.NET](/docs/generated/sdks/server-side/dotnet.md) | [PHP](/docs/generated/sdks/server-side/php.md) | [Rust](/docs/generated/sdks/server-side/rust.md) | [Unleash Proxy](../../generated/unleash-proxy.md) |
-| --- | :-: | :-: | :-: | :-: | :-: | :-: | :-: | :-: | :-: |
-| **Category: Initialization** |  |  |  |  |  |  |  |  |  |
-| Async initialization | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ❌ | ✅ | N/A |
-| Can block until synchronized | ✅ | ✅ | ✅ | ⭕ | ⭕ | ✅ | ✅ | ⭕ | N/A |
-| Default refresh interval | 10s | 15s | 15s | 15s | 15s | 30s | 30s | 15s | 5s |
-| Default metrics interval | 60s | 60s | 60s | 60s | 60s | 60s | 30s | 15s | 30s |
-| Context provider | ✅ | N/A | N/A | N/A | N/A | ✅ | ✅ | N/A | N/A |
-| Global fallback function | ✅ | ✅ | ✅ | ✅ | ❌ | ❌ | ❌ | ❌ | N/A |
-| Toggle Query: `namePrefix` | ✅ | ✅ | ❌ | ❌ | ❌ | ❌ | ✅ | ❌ | ✅ |
-| Toggle Query: `tags` | ✅ | ✅ | ❌ | ❌ | ❌ | ❌ | ✅ | ❌ | ✅ |
-| Toggle Query: `project_name` | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | N/A | ⭕ | ✅ |
-| **Category: Custom Headers** |  |  |  |  |  |  |  |  |  |
-| static | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ⭕ | N/A |
-| function | ✅ | ✅ | ⭕ | ✅ | ✅ (4.3) | ✅ | ✅ | ⭕ | N/A |
-| **Category: Built-in strategies** |  |  |  |  |  |  |  |  |  |
-| [Standard](../reference/activation-strategies#standard) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
-| [Gradual rollout](../reference/activation-strategies#gradual-rollout) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
-| [Gradual rollout: custom stickiness](../reference/activation-strategies#customize-stickiness-beta) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ⭕ | ✅ |
-| [UserID](../reference/activation-strategies#userids) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
-| [IP](../reference/activation-strategies#ips) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
-| [IP](../reference/activation-strategies#ips): CIDR syntax | ✅ | ✅ | ✅ | ✅ | ✅ | ⭕ | ✅ | ✅ | ✅ |
-| [Hostname](../reference/activation-strategies#hostnames) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
-| **Category: [Custom strategies](../custom-activation-strategies.md)** |  |  |  |  |  |  |  |  |  |
-| Basic support | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
-| <span id="strategy-constraints">**Category: [Strategy constraints](../strategy-constraints.md)**</span> |  |  |  |  |  |  |  |  |  |
-| Basic support (`IN`, `NOT_IN` operators) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
-| <span id="strategy-constraints-advanced-support">Advanced support (Semver, date, numeric and extended string operators)</span> (introduced in) | ✅ (5.1) | ✅ (3.12) | ✅ (3.3) | ✅ (5.1) | ✅ (4.2) | ✅ (2.1) | ✅ (1.3.1) | ⭕ | ✅ (0.8) |
-| **Category: [Unleash Context](../reference/unleash-context)** |  |  |  |  |  |  |  |  |  |
-| Static fields (`environment`, `appName`) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
-| Defined fields | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
-| Custom properties | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
-| **Category: [`isEnabled`](../client-specification#implementation-of-isenabled)** |  |  |  |  |  |  |  |  |  |
-| Can take context | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
-| Override fallback value | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
-| Fallback function | ✅ | ✅ | ✅ | ✅ | ✅ | ⭕ | ⭕ | ⭕ | ✅ |
-| **Category: [Variants](../feature-toggle-variants.md)** |  |  |  |  |  |  |  |  |  |
-| Basic support | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
-| Custom fallback variant | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ⭕ | ✅ |
-| Custom weight | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ⭕ | ✅ |
-| [Custom stickiness (beta)](../stickiness.md#custom-stickiness-beta) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ⭕ | ✅ |
-| **Category: Local backup** |  |  |  |  |  |  |  |  |  |
-| File based backup | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ⭕ | ✅ |
-| **Category: Usage metrics** |  |  |  |  |  |  |  |  |  |
-| Can disable metrics | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
-| Client registration | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
-| Basic usage metrics (yes/no) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
-| [Impression data](../impression-data.md) | ⭕ | ✅ | ⭕ | ⭕ | ⭕ | ⭕ | ✅ | ⭕ | ✅ |
-| **Category: Bootstrap (beta)** |  |  |  |  |  |  |  |  |  |
-| Bootstrap from file | ✅ | ✅ | ✅ | ⭕ | ✅ | ✅ | ✅ | ⭕ | ✅ |
-| Custom Bootstrap implementation | ✅ | ✅ | ✅ | ⭕ | ✅ | ✅ | ✅ | ⭕ | ✅ |
+| Capability | [Java](/docs/generated/sdks/server-side/java.md) | [Node.js](/docs/generated/sdks/server-side/node.md) | [Go](/docs/generated/sdks/server-side/go.md) | [Python](/docs/generated/sdks/server-side/python.md) | [Ruby](/docs/generated/sdks/server-side/ruby.md) | [.NET](/docs/generated/sdks/server-side/dotnet.md) | [PHP](/docs/generated/sdks/server-side/php.md) | [Rust](/docs/generated/sdks/server-side/rust.md) |
+| --- | :-: | :-: | :-: | :-: | :-: | :-: | :-: | :-: |
+| **Category: Initialization** |  |  |  |  |  |  |  |  |
+| Async initialization | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ❌ | ✅ |
+| Can block until synchronized | ✅ | ✅ | ✅ | ⭕ | ⭕ | ✅ | ✅ | ⭕ |
+| Default refresh interval | 10s | 15s | 15s | 15s | 15s | 30s | 30s | 15s |
+| Default metrics interval | 60s | 60s | 60s | 60s | 60s | 60s | 30s | 15s |
+| Context provider | ✅ | N/A | N/A | N/A | N/A | ✅ | ✅ | N/A |
+| Global fallback function | ✅ | ✅ | ✅ | ✅ | ❌ | ❌ | ❌ | ❌ |
+| Toggle Query: `namePrefix` | ✅ | ✅ | ❌ | ❌ | ❌ | ❌ | ✅ | ❌ |
+| Toggle Query: `tags` | ✅ | ✅ | ❌ | ❌ | ❌ | ❌ | ✅ | ❌ |
+| Toggle Query: `project_name` | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | N/A | ⭕ |
+| **Category: Custom Headers** |  |  |  |  |  |  |  |  |
+| static | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ⭕ |
+| function | ✅ | ✅ | ⭕ | ✅ | ✅ (4.3) | ✅ | ✅ | ⭕ |
+| **Category: Built-in strategies** |  |  |  |  |  |  |  |  |
+| [Standard](../reference/activation-strategies#standard) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
+| [Gradual rollout](../reference/activation-strategies#gradual-rollout) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
+| [Gradual rollout: custom stickiness](../reference/activation-strategies#customize-stickiness-beta) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ⭕ |
+| [UserID](../reference/activation-strategies#userids) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
+| [IP](../reference/activation-strategies#ips) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
+| [IP](../reference/activation-strategies#ips): CIDR syntax | ✅ | ✅ | ✅ | ✅ | ✅ | ⭕ | ✅ | ✅ |
+| [Hostname](../reference/activation-strategies#hostnames) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
+| **Category: [Custom strategies](../custom-activation-strategies.md)** |  |  |  |  |  |  |  |  |
+| Basic support | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
+| <span id="strategy-constraints">**Category: [Strategy constraints](../strategy-constraints.md)**</span> |  |  |  |  |  |  |  |  |
+| Basic support (`IN`, `NOT_IN` operators) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
+| <span id="strategy-constraints-advanced-support">Advanced support (Semver, date, numeric and extended string operators)</span> (introduced in) | ✅ (5.1) | ✅ (3.12) | ✅ (3.3) | ✅ (5.1) | ✅ (4.2) | ✅ (2.1) | ✅ (1.3.1) | ⭕ |
+| **Category: [Unleash Context](../reference/unleash-context)** |  |  |  |  |  |  |  |  |
+| Static fields (`environment`, `appName`) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
+| Defined fields | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
+| Custom properties | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
+| **Category: [`isEnabled`](../client-specification#implementation-of-isenabled)** |  |  |  |  |  |  |  |  |
+| Can take context | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
+| Override fallback value | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
+| Fallback function | ✅ | ✅ | ✅ | ✅ | ✅ | ⭕ | ⭕ | ⭕ |
+| **Category: [Variants](../feature-toggle-variants.md)** |  |  |  |  |  |  |  |  |
+| Basic support | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
+| Custom fallback variant | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ⭕ |
+| Custom weight | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ⭕ |
+| [Custom stickiness (beta)](../stickiness.md#custom-stickiness-beta) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ⭕ |
+| **Category: Local backup** |  |  |  |  |  |  |  |  |
+| File based backup | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ⭕ |
+| **Category: Usage metrics** |  |  |  |  |  |  |  |  |
+| Can disable metrics | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
+| Client registration | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
+| Basic usage metrics (yes/no) | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
+| [Impression data](../impression-data.md) | ⭕ | ✅ | ⭕ | ⭕ | ⭕ | ⭕ | ✅ | ⭕ |
+| **Category: Bootstrap (beta)** |  |  |  |  |  |  |  |  |
+| Bootstrap from file | ✅ | ✅ | ✅ | ⭕ | ✅ | ✅ | ✅ | ⭕ |
+| Custom Bootstrap implementation | ✅ | ✅ | ✅ | ⭕ | ✅ | ✅ | ✅ | ⭕ |
 
 ## Community SDKs ❤️ {#community-sdks}