Improve the search using weighted fields and sorting by WoT

[dtonon]

Currently the search returns results in a quite random order:

The correct utxo profile is below the first view, after many impostors and random users.

Some updates can improve the UX:

• Give a different weight to different fields, for example the name is more important than bio or other metadata fields;
• Sort results by Wot;
• Add a dropdown to filter the results' kind;

These two factors often collide since they both apply a sort. A quick solution can be transforming the WoT in a factor to add to the calculated weight, and anyway finally sort equal weight by WoT. Of course we weighting algo needs also take in consideration different kinds (profiles, notes, ...).