URL redirection

[ntarocco]

Implement URL redirection of:

• /collection/CERN%20Students%20Projects -> /communties/<SSPN>
• /search?...cc=CERN Students Projects...[p=<query>] -> /communties/<SSPN>/search?q=<query>
• Also with c only on not? Check search_engine.py not for now
• Ideally, we should parse the p= param, to detect if there is a Marc21 field, and redirect to the same search re-mapped. Example: p=245__a:my title (or p=245:my title) should redirect to q=metadata.title:my title. The issue is that some fields change per collection. Do we take it into account? Not for now
• Redirect submission form for sspn, when url is https://cds.cern.ch/submit and has parameters comboDEPIN=CSPN and doctype=DEPIN, redirect to https://dev-cds-rdm.web.cern.ch/uploads/new?community=sspn

Technical details

We don't want to expose a /legacy anywhere, therefore we can't respond with a Redirect /legacy from current CDS.

For the migrated collection:

1. update CDS webserver to redirect migrated paths /<path> to repository.cern/<path>. For example, /collection/SSPN to repository.cern/collection/SSPN

2. in new CDS webserver, we should add an internal rewrite/redirection/rule in the main location similar to:

   when the host is not repository.cern
   AND
   the URL path matches one of the migrated paths (e.g. /collection, /files, /record)
   THEN
   add an internal rewrite to /legacy/<path>
   OTHERWISE
   the request should go to the / (maybe a valid URL for InvenioRDM.