Spike: client-side redirects in the docs

[ipopescu]

From a conversation with @andrzej-casper, I am opening a placeholder ticket to implement client-side redirects in our docs. Currently, we have redirects defined on the server side. We need a solution allowing multiple URLs to point to a single place. Slugs do not achieve this (they are one-to-one mappings); they are just temporary workarounds when we update a URL. There are plugins available for client-side redirects in Docusaurus.

Definition of done:

• initial investigation has been completed, and a plug-in selected
• if it is possible, as part of this card, implement client-side redirects
• remove all slugs from the documentation
• work with @bradjohnl to update any server-side redirects

FYI @ACStoneCL