nitweb: improve search results

The search bar will be likely on of the most used features of nitweb.

• [x] smart case-insensitivity
• [x] sort with textual proximity
• [x] click on the card, not the individual link (especially since a miss-click close the popup)
• [x] close the popup if click outside the popup
• [x] more results (special page with search results?)
• [ ] show fullname (or at least the package) in the results. e.g. a search for Model gives 3 classes without more information :(