[GIT-PULLS] [php-src] PR #23372: docs: Internals Book improvements (05)

[email protected] (NickSdot)
Newsgroups php.git-pulls
Message-ID <kn7qPOANgBglzIyaCuHGFsvDUqdm5mQVwMVmRwIiP0I@main.internal.php.net> 
Pull Request: https://github.com/php/php-src/pull/23372
Author: NickSdot

Depends on: #23368 (01), #23369 (02), #23370 (03), #23371 (04)

This PR moves the two testing pages to a new hierarchy in preparation for the next PRs that reorganise the contents into a structure that can grow without crowding unrelated parts. As with the PRs before, this exists solely to have a helpful diff in the next PR. Diff to 04: https://github.com/NickSdot/php__php-src/compare/docs/restructure-04...docs/restructure-05

### Preview
Branch: https://nicksdot.github.io/docs-restructure-05/
Final: https://nicksdot.github.io/docs-restructure-final/
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