Create an advanced search page

[rtroncy]

ADASilk proposes so far:

• a full text search from the landing page
• a facetted browser for refining search from the object page

We should also consider adding a third page, for advanced users. The design could be inspired from Gallica, https://gallica.bnf.fr/services/engine/search/advancedSearch/. The idea is that the full screen would be used for the user to compose its query, adding fields (or paths in the Knowledge Graph) + specifying Boolean operators.

This page could also embeds the sparnatural query builder