Adds license, and tags page.

 * Adds license file at the bottom of the sidenav
 * Adds tags page
 * Updates pagination to be a more fitting size (not debug)
 * Adds plugin function to get the current date
   Also adds a framework to add more jinja functions
 * Lots of css changes and fixes, mostly to the sidenav
   * Sidenav now has borders fixed, and on more items
 * removes accidental dump (debug code)