Show currently logged in user
Move main details from users/show view into users/_details
Introduce a users/_full_details partial view

Most of the content of the users/show view is moved into the partial.
Inside partials, render other partials with absolute paths

This allows including the all partials from other controllers.

Before this change, this would cause Rails to look for all recursively
included partials inside the original controller's view directory
instead of the included partial's directory.
Fix the lists on the dashboard

Previously, the li tag was only output once, instead of once per list
item. This uses the content_tag_for helper, which also automatically
adds id and class attributes based on ActiveRecord info, but that's not
a problem.
Don't user instance variables in partial views

Instead, always explicitely pass local variables to views, for extra
explicitness and reusability.