[openstreetmap/openstreetmap-website] Pass on 'rel="me"' attribute for Mastodon Links (Issue #3859)

[Pieter Vander Vennet]

I had an _extremely_ quick look to the meaning of the various 'relation'-values. IMHO, using `rel="me noopener nofollow noreferrer"` would be fine, even though the combination of `me` and `nofollow` seem a bit contradictory. The `nofollow` signals that _OpenStreetMap.org does not endorse the link_ while the `me` signals that _this user has this mastodon account_ (but I'm not an expert in these matters. But maybe I should add a few of those tags on user-generated links in MapComplete too). 

I'm not familiar with Ruby; but it seems that [this](https://github.com/rgrove/sanitize#custom-configuration) library is used for sanitation, which uses a whitelist of what is allowed. As `rel`-tags are _not_ in this configuration; they are dropped before adding the `noreferer nofollow noopener` again.

I do think that adding `:attributes => {"a" => {"rel" => "me"} }` might just work to keep the `rel=me` intact.

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