Archive Wiki documentation / Change management

[WalterMoar]

Once this documentation goes live on Backstage we need to do change management so that people start going to the right place. We may have to replace every Wiki page with a redirect (automatic or a link) to the new documentation.

Also, the app contains links to the Wiki, as does the documentation in the repo. These will both need to be updated.

[vijaivir]

I've added a link to all the wiki pages pointing to the Techdocs.