always cache loaded templates to speed up our single resource view

Whenever a template is changed, the server now has to be restarted for
the changes to take effect. Our single resource view now loads more than
ten times faster than before (at least on my local development machine
in `DEBUG` mode).
Merge pull request #719 from cspurk/various-improvements

always cache loaded templates to speed up our single resource view
Added more META-SHARE nodes in the portal page.
Added more META-SHARE nodes in the portal page.
Fixed images alignments.