Docs: Fold all legacy "FAQ" content into the rest of the document #11363
Description
All the content in docs/faq/ is from the legacy FAQ (i.e., from https://www.open-mpi.org/faq/). It was trivially converted over to RST, but the content was largely left the same.
The intent is to audit all that content and either:
- Update it if necessary and fold it into other parts of the RST doc (thereby removing it from the
docs/faqdirectory), or - Remove it if is it out of date / no longer necessary
When this is done, the "FAQ" section should likely disappear from the RST docs.