[GIT-PULLS] [php-src] PR #23374: docs: Internals Book improvements (07)

[email protected] (NickSdot)
Newsgroups php.git-pulls
Message-ID <[email protected]>
Pull Request: https://github.com/php/php-src/pull/23374
Author: NickSdot

Depends on: #23368 (01), #23369 (02), #23370 (03), #23371 (04), #23372 (05), #23373 (06)

This PR gets the extensions contents from `docs-old` in order. It removes obsolete and clearly userland targeting stuff which is not relevant to the internals book. Diff to 06: https://github.com/NickSdot/php__php-src/compare/docs/restructure-06...docs/restructure-07

**Important:**
Personally I think unbundled extensions have nothing todo with the internals book. It should live in the actual PHP Docs. However, it was part of the `docs-old` and I didn't want to decide on my own whether to remove the "Unbundled Extensions" page or not. A decision is needed.

### Preview
Branch: https://nicksdot.github.io/docs-restructure-07/
Final: https://nicksdot.github.io/docs-restructure-final/
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