Group search results by section (Doc, Product Update, Guides)

## Current Behavior

Right now, the search in the hub content displays a list of result without a lot of context (only a title and an excerpt) as seen below:


## Ideas on potential future behavior

- It would be really nice if the items of the results are grouped by section (Documentation, Product Update or Guides), or if we add a visual label, or whatever other nice UI trick to quickly identify which result comes from which section.

- Ideally, the groups order would depend on which page we are in (if the user visits a documentation page, the “Documentation” section of search results should be displayed first)