Add rel=me to user's website link

What does this MR do?

This MR adds "me" relation to user's profile website link.

rel=me links allow cross-linking of user's identities. This behavior is used by software to determine if user controls profiles on two different sites. For example Mastodon uses it to display verified badge on links.

Both Twitter and GitHub automatically add rel=me to links added to users' profiles.

See: https://www.zylstra.org/blog/2018/10/mastodon-rel-me/

See: http://microformats.org/wiki/rel-me

What are the relevant issue numbers?

I didn't file an issue, this change is quite small.

Does this MR meet the acceptance criteria?

Change is quite small, I think most of these don't apply (but please correct me if I'm wrong)

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer

Happy New Year! 🎉