base: separation of bootstrap bundle

* Resolves the conflict between Bootstrap and jQuery UI by making
  jQuery UI to be loaded before Bootstrap.

* NOTE use `noConflict()` from `bootstrap.js` to get access to jQuery UI
  functions covered by Bootstrap.

Signed-off-by: Kamil Neczaj <kamil.neczaj@cern.ch>
Co-authored-by: Jiri Kuncar <jiri.kuncar@cern.ch>
docs: addition of bundles to base.rst

Signed-off-by: Kamil Neczaj <kamil.neczaj@cern.ch>