keyhive sofle rgb: fix configuration.

[winder]

Description

• Change PRODUCT_ID and DEVICE_VER to match sofle/rev1.
• Update readme.md to use qmk and via keymap.

Note: With this change, the keyhive PRODUCT_ID and DEVICE_VER match that of sofle/rev1. Strictly speaking, this is incorrect for a couple reasons (it's a different product, and the v1/v2 keyboards are slightly different). It is, however, what the keyhive fork does. It also corrects the via issues mentioned in the readme.

I'll probably look into updating via as well. If I do that, I'll create a follow-up PR here. Until then, I believe these changes are an improvement to the current sofle/keyhive support.

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout/userspace (addition or update)
• Documentation

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[fauxpark]

If they are different keyboards then for VIA purposes the product IDs must be different.

[winder]

If they are different keyboards then for VIA purposes the product IDs must be different.

In this PR I'm updating the configuration to match the keyhive fork:
keyhive@a388b3e#diff-9134896d5f7bbd3575e3197e4752653dff4a420459009bca10ad94f09e909d57R3

I'm still experimenting with this, but it seems that there are some incompatibilities when forcing keyhive v2.1 to use the open source sofle v1 configuration:
the-via/keyboards#337 (comment)

Not sure the best way to proceed. From my perspective this works as well as the keyhive fork, but maybe that isn't good enough?

[winder]

I figured out why things are a little messed up in the sofle/keyhive configuration. Half of the code has been taken from https://github.com/solartempest/sofle and half from https://github.com/keyhive/qmk_firmware

The keyhive/qmk_firmware changes work better out of the box, but are less advanced than the solartempest/sofle fork.

Closing this PR for now, I'll re-open with later once I've cleaned things up.