Remove never actually used code from five years ago
Remove vestigial routes

Namefinder support was removed in 1a0728ec7b46efdaf3cf9455f288f08ecd465d2b.
Use reverse geocoders for any lat/lon queries

This simplifies the implementation, allows code sharing with
"Where am I?", and produces friendlier results for lat/lon
searches (actual reverse geocode results rather than a raw
lat/lon display).
Add help page
adjustments to help page + better copy
Style
Link to help page from welcome
Adjust header layout for user menu
Remove LearnOSM
Frontpage redesign
Sidebar work
Convert history page to sidebar layout
Convert browse details to sidebar layout
Redirect ?node=n and similar to browse pages
Fix display of browsed objects on map
Fixes
Clean up search CSS
Work on changeset display
Remove unused bounds parameters

These were used by "View on larger map" links,
which no longer exist.
Fixes