docs: work minisite post-launch fixes

* Localization for table of contents.

* Replace occurrences of 'app restrictions' with the preferred
term 'managed configurations' (see go/afw-words). Update resource
card titles and add page redirects.

* In guide, update language for SSO with Chrome Custom Tabs.
(Cherry-picked from 1056063.)

* Add resource card for 'Your Apps at Work' video.

bug: 28378252, 27744376
Change-Id: I8bc2e87d0486159bdd6680600b783af7334c3a58