Added FAQ page
Welcome / register page tweaks
Replaced Like button with Edit button for own posts
Implemented /user/[username] pages
Terminology fix: /user/ -> /blog/
Replaced reblog saves with generalized "sessions"

Sessions apply to every Dashboard or dashboard-like page. A unique identifier
is set as the URL hash and the session (posts state, scroll position...) is
periodically saved. Upon (re)loading a page with this ID, the session is
restored.
Handle quota errors and expired session IDs