refactor(/docs): rework documentation structure layout

[piyoki]

Background

Refactor documentation structure to make sync easier.

Preview: https://github.com/daeuniverse/dae/tree/docs_refactor/docs

Checklist

• The Pull Request has been fully tested
• There's an entry in the CHANGELOG
• There is a user-facing docs PR against https://github.com/daeuniverse/dae

Full changelogs

• refactor(/docs): rework documentation structure layout
• refactor(/docs): update file reference paths
• feat(/docs): add English version of other-proxy-protocol.md
• refacotr: move docs/templates/ docs/sync/ to hack/
• fix(example.dae|readme): update ref link to adopt new file structure
• refactor: rename other-proxy-protocol.md -> proxy-protocols.md
• docs(readme): add ref to proxy-protocols.md
• feat(/docs): add English version of how-it-works.md
• refactor: rename how-it-works; add nav links

Issue reference

https://github.com/daeuniverse/dae-docs/issues/34

[dae-prow]

❌ Your branch is currently out-of-sync to main. No worry, I will fix it for you.

[piyoki]

Reference links are working fine as expected. Good job! @earrmouth

[dae-prow]

❌ Your branch is currently out-of-sync to main. No worry, I will fix it for you.

[mzz2017]

Please do some work on /example.dae and /README.md, thanks.

[dae-prow]

❌ Your branch is currently out-of-sync to main. No worry, I will fix it for you.

[piyoki]

Please do some work on /example.dae and /README.md, thanks.

What work are you referring to?

[mzz2017]

[dae-prow]

❌ Your branch is currently out-of-sync to main. No worry, I will fix it for you.

[piyoki]

Resolved in 9576193

[dae-prow]

❌ Your branch is currently out-of-sync to main. No worry, I will fix it for you.

[dae-prow]

❌ Your branch is currently out-of-sync to main. No worry, I will fix it for you.

[dae-prow]

❌ Your branch is currently out-of-sync to main. No worry, I will fix it for you.

[dae-prow]

❌ Your branch is currently out-of-sync to main. No worry, I will fix it for you.

[piyoki]

The required check has been passed. Ready for review