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
Add about page
Inline edit menu partial, refine CSS
Refine user menu CSS