Fix onboarding library route model keys
Simplify anime/manga index sorting
Fix n+1 query.
Respect sfw_filter setting in Anime#index.
add versions table, and model
add versionable concern, allow a user to edit an anime entry (certain fields)
create index page of pending edits
add link to pending page to kotodama
add pending.show page
implement approve/reject of edits
limit pending page to staff only