New search bar component

[tchoutri]

We want to have a new text input component for searches, with:

• Disabled auto-complete
  • If JS is enabled, we can load real-time from a search endpoint
  • if JS is disabled, we can save the last searches in a cookie that is sent to the server and then injected as datalist(which cannot be styled too much unfortunately)

• Modifiers selector

The dynamic addition of the modifier would be done with JS. Again, a no-JS fallback could be done using <datalist>. Let's examine this a bit further.