Several minor bugfixes from feedback

[JuanjiJG]

Hello everybody!

This PR brings a bunch of minor bugfixes, making the app better with small improvements over the user interface. This is the list of changes that come with this PR:

• Fixed missing shadow on Kibana filter bar.
• Refactored linkable elements with a new CSS class, wz-text-link and wz-text-active.
  • This classes might change in the future.
  • Removed all the fa-eye icons.
  • Adjusted colours for title headings.
  • Removed bold text where possible.
• Fixed some space issues on Agents/General information ribbon.
• Better truncating of Name and OS field on Agents/General information ribbon, with tooltip incorporated, showing the full text.
• Adjusted line heights on the JSON viewer.
• Increased height between Kibana filter bar and Panels/Discover buttons on Overview and Agents.

I hope you like this changes and bugfixes.

Best regards,
Juanjo

[havidarou]

LGTM!!