Site Search 360 setup fine-tuning

[ralf57]

Once the pages structure is stable, the Site Search 360 setup needs to be fine-tuned in order to have relevant search suggestions and results.

Also take into account this preliminary feedback: #37 (comment)

[ralf57]

@jmuheim I've done an initial configuration and (re)indexing.
There's still room for improvement but the results (suggestions) are much better now.
Apparently it's not possible to get the search snippet with the suggestions search but only with the proper search results but I am in touch with the SS360 guys to see what we can do.

Update: it's possible but undocumented. Done in #37

[ralf57]

@jmuheim could you please check if the results are now more pertinent?