Removes all the workbox documentation and redirects to the new docs.

[malchata]

What's changed, or what was fixed?

• Removes all Workbox content from d.g.c.
• Redirects /web/tools/workbox/ to the new workbox docs.

Target Live Date: 2022-05-25

• This has been reviewed and approved by (@jeffposnick, @petele).
• I have run npm test locally and all tests pass (@malchata).
• I have added the appropriate type-something label (@jeffposnick, @petele).
• I've staged the site and manually verified that my content displays correctly (@malchata).

CC: @petele, @jeffposnick

[jeffposnick]

Right now, URLs that point to specific versions of the Workbox JSDocs (not /latest/, but something like https://developers.google.com/web/tools/workbox/reference-docs/v5/module-workbox-build#.generateSW with /v5/ in the URL) will not redirect anywhere.

I believe, based on the last time we discussed this, that the removal of these historical docs is inevitable, since we can't port the JSDoc generation to d.c.c. But does this PR add in redirects for those older versioned docs, so the URLs will at least point somewhere?

[malchata]

@jeffposnick, I added redirects for the following URLs:

/web/tools/workbox/reference-docs/v5 /web/tools/workbox/reference-docs/v4 /web/tools/workbox/reference-docs/v3 /web/tools/workbox/reference-docs/v2 

Are there any others I missed?

[jeffposnick]

Thanks!