Remove non-canonical docs versions from sitemap.xml

## Acceptance criteria - [ ] Board meeting minutes are accessible only on the `www` subdomain, not on the `docs` subdomain - [ ] Community pages such as `/community/desktops/` and `/community/logos/` are available only on the `www` subdomain, not the `docs` subdomain - [ ] If needed, links are updated or redirects are added to avoid 404s for these pages (investigation needed) ## Original report It looks like we may be sending confusing signals to Google by putting old docs versions in `sitemap-.xml`, but then telling it only one of those versions is canonical: Google's commentary on this error: https://support.google.com/webmasters/answer/7440203#submitted_url_not_selected_as_canonical