use bootstrap 3
change root page
fix posts form links and makeup
fix subjects form links and makeup
use bootstrap 3
add admin welcome
fix admin auth
fix redirection aftes signed out
fix redirection after signed in
Merge branch 'feature/fix_links' into develop

* feature/fix_links:
  fix redirection after signed in
  fix redirection aftes signed out
  fix admin auth
  add admin welcome
  use bootstrap 3
  fix subjects form links and makeup
  fix posts form links and makeup
  change root page
  use bootstrap 3
Merge branch 'release/v2.2.0'

* release/v2.2.0:
  fix redirection after signed in
  fix redirection aftes signed out
  fix admin auth
  add admin welcome
  use bootstrap 3
  fix subjects form links and makeup
  fix posts form links and makeup
  change root page
  use bootstrap 3