Removes and redirects Lighthouse landing page

[malchata]

What's changed, or what was fixed?

• Removes and redirects the Lighthouse landing page to d.c.c.
• Updates various links to point to redirect destinations directly.

Fixes: GoogleChrome/developer.chrome.com#2008

Target Live Date: 2022-06-01

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

CC: @petele, @brendankenny