Revert "Revert "Automatically redirect from index.html to 20-20-20.html""

This reverts commit 7a08f8cd2e84344e87b063f34b1c4fe5474c89a7.
Revert "Revert "Actually redirect to 20-20-20.html""

This reverts commit f8f115e4f9bf4dffe53369ae67aaf0788ea81977.
Revert "Revert "Actually redirect to 20-20-20.html for real this time""

This reverts commit d4aca9d42a48752971ffd0ac28c7e7728f952972.