Replace the deprecated nav-list with list-group

Also create a custom generic markup called 'submodule-navigation' with a
default header font decoration and correctly colored list items.
Add missing HTML encodings
Adapt fjelltreffen templates for BS3
Reference the correct category index
Clean up LESS for foreninger
Use columns to list county choices
Adapt the rest of foreningstemplates for BS3
Adapt fotokonkurranse templates for BS3
Adapt instagram templates for BS3
Remove the deprecated bootstrap-responsive sheet reference
Adapt membership templates for BS3
Adapt remaining templates for BS3
Replace all hide classes with jq-hide
Remove the unused welcome message for the user page
Remove bootstrap2 compatibility templates
Adapt the rowiterator tag for BS3
Adapt user account templates for BS3
Adapt user login templates for BS3
Adapt remaining user-app templates for BS3
Remove unnecessary full-column row