Make "No Comments" disappear after first comment
Add "show more" link for comments

This adds a "show more" link for comments.
Currently, it loads 5 comments per click.
If there are no more comments, the link is not shown anymore.
CSS improvements
Add comment deletion functionality

Users can now delete their own comments
repair heart styles
add refined details shim
user token in controller and helper using service object
hearts button helper
views and styles for hearts with details
some js
make details elements look like accordions (except for blue)
Remove global index, move differing functionality to pundit scope
make navigate to anchored library work
wip, fixing tests
fix the double library form somewhat