sphinx/conf.py: Add redirect for swh-web/uri-scheme-identifiers

Corresponding RST document has been renamed to uri-scheme-swhids.rst
so add a redirection for URL backward compatibility.

swh/docs/sphinx/conf.py

@@ -158,6 +158,7 @@ redirects = {
     "keycloak": "../../sysadm/user-management/keycloak/index.html",
     "mirror": "architecture/mirror.html",
     "users": "user",
+    "swh-web/uri-scheme-identifiers": "uri-scheme-swhids.html",
 }