Fix links inside tables: [[Text|Target]] breaks on the table pipe GitHub's markdown table parser splits cells on | before Gollum processes [[...]] wiki-link syntax, so every link inside a table cell (the Home page's Guides table, the Uploads/Downloads/Retry/Request-Management tables) rendered as a broken literal [[Text instead of a link. Switched every cross-page link in the wiki, in and out of tables, to plain markdown link syntax [Text](Target), which has no pipe conflict and works identically everywhere.
Drop redundant per-page nav footer; the sidebar already covers it
Add wiki: Home, guides, and reference pages