Search results with breadcrumbs. Search with filters by section. (#1914)

* Search results with breadcrumbs. Search with filters by section.

* Change label: training -> documentation

* fix search filter: plone.restapi and plone.api

* breadcrumbs: space via html

Co-authored-by: Steve Piercy <web@stevepiercy.com>

* Rip out search filter by category

* Update searchtools.js

* Add breadcrumbs to search results

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Co-authored-by: Steve Piercy <web@stevepiercy.com>

Author: ksuess