Bring the documentation up to the published site and fill its gapsdocs/current-state

The documents still described a site in maintenance with two languages and
a forum page with a language menu. They now describe what is published, and
three documents are new.

New, under Documents/:
- README.md: index of the documentation.
- ARCHITECTURE.md: the frontend, the backend and the forum page, what each
  serves, what the site deliberately does not contain, and how search
  engines and crawlers are treated.
- LOCALIZATION.md: the four languages, how a page picks one, what counts as
  a visitor's choice, how Hebrew text is laid out, where the text lives and
  how to add a language.
- DEVELOPMENT.md: requirements, the commands of each part, the dependency
  locks and checksums, the tests and what CI enforces.

Updated:
- README.md: the site is public; four languages and the browser-language
  default; a documentation section; the Dokka gate.
- CONTENT.md: the forum notice without a language menu; translation rules
  for four languages, including preferring the term a reader would use over
  a literal one; the crawler rules as an owner decision.
- OPERATIONS.md: the live route table; the release steps for the directory
  layout on the server, with the SELinux labelling order that caused an
  outage once; cache keys for the forum files and CDN caching; maintenance
  mode as a fallback instead of the current state; rollback by directory;
  checksum regeneration with --refresh-dependencies; the post-release check
  for four languages and right-to-left text.

No source file changes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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