* docs: rename Network Routes to Routes, deprecate, and relocate Browser Client Architecture
- Rename the docs sidebar entry "Network Routes" to "Routes" and the page H1
- Add a deprecation note to the Routes page: all use cases except exit nodes
have moved to Networks; reconcile the body framing accordingly
- Move Browser Client Architecture under Peers > Browser Client
(/manage/peers/browser-client/architecture), nest the nav, add a redirect,
and update cross-links
- Shrink the site-to-site Architecture diagram boxes to fit their content
* docs: rename Routes nav 'Concept' link to 'Overview'
f83b1b65a4