Revert "Remove RawDivView and use regular handlebars"

This reverts commit e7f349ff0f060a114bb456fe7dae1cdb5dbc1833.
Version checks: tolerate old version check data that can happen immediately after upgrading but forgetting to restart sidekiq/clockwork. Don't cache version check data along with other dashboard data.
update copy for self-deleted posts

still needs variable replacement for the 24 hours part
encourage getting master not latest-release
add security note at bottom
Fix to allow admins to change the case of a someone's username
Use ellipsis in dashboard referred topics table. Add .overflow-ellipsis css helper.
Strip trailing and leading spaces from category names
cross-links and copyedits
move security reporting up to the top
copyedits
more security doc copyedits
just install, not ubuntu install
An attempt at some Perf improvements
remove "ubuntu" just make this "install" doc
update install doc
clean up master install guide a bit
copyedits
Send login_required to discourse hub
simplify @mention CSS, add $quote-background color