Questions about flang catalog entry

[bernhold]

Regarding https://github.com/cass-community/new/blob/main/_sw/flang.md

I can't find this in e4s or in the spack package index. I've tried the originally provided names as well as variations.

In spack there are multiple llvm packages, but I don't know whether any include flang.

Website URL and Documentation URL are the same. In this case, Documentation seems to be more the more appropriate label. Propose we remove the Website entry.