Expose website as a top-level attribute, and ignore index.html, both to
make test-deving the site easier
Change-Id: Ic056446e322ec5f69583d316998103883fc8d55b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2700
Reviewed-by: glittershark <grfn@gws.fyi>
Tested-by: BuildkiteCI