Remove SSR links from library filters

[txau]

Continuing with some improvements for performance, we don't need the library filters to be crawlable links. We are blocking this content from robots with a robots.txt configuration, but since many robots do not respect these rules, it would be advisable to also remove these unneeded links, keeping the library filters as a submiteable POST form.

Using a text browser we can see we are rendering SS links:

IMPORTANT NOTE: we still want to keep template types, sorting and ordering as actually crawlable links to have some basic content discovery.

Also, this is totally unrelated to the GET query string to library filter mapping, which needs to keep working as of today.