Search: Enable searching by both Nexus ID and self

**Description**
Currently, if a user searches with a resource id URL, the entity shows as the top hit.
Now if you search with a resource's nxv:self, none of the top hit appear to relate to the relevant entity.

Acceptance criteria:
- When entering a HTTP based URL, search should offer the user to search by id/self
- Should there be hits, we should only show the resource to which belong this id/self
- In case no resource if found (ie. maybe we don't index this entity), a message should inform the user that a resource with this id/self does not exist or is not accessible to the user.