search: index_base.html inheritance schema changed

* Inherits from searchbar_frame.html instead of
page_base.html to share the search-bar

Signed-off-by: Kamil Neczaj <kamil.neczaj@cern.ch>
search: Search-bar adaptation to typeahead 0.10

* Makes the parser configurable

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