docs: fix docsdate  target to exclude buildsystem/docs/website and include/web
docs: fix header path and a missing file
docs: gitignore
tex: fix Argonne contract number in \DefaultSupport
Merge branch 'jed/doc-cleanup'

* jed/doc-cleanup:
  tex: fix Argonne contract number in \DefaultSupport
  docs: gitignore
  docs: fix header path and a missing file
  docs: fix docsdate  target to exclude buildsystem/docs/website and include/web