MBS-13820: Added links to Mastodon and Bluesky in the footer

[Suvid-Singhal]

Problem

MBS-13820

Solution

• Removed the Twitter URL from the footer
• Added links to Mastodon and Bluesky in the footer

Testing

These were just minor cosmetic changes and they work fine on my test environment.

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[brainzbot]

Can one of the admins verify this patch?

[reosarevok]

@brainzbot, ok to test

[yvanzo]

Thank you @Suvid-Singhal for this contribution.

I just reformatted your pull request’s title to make it readable by our ticket-updater bot. See:

• https://github.com/metabrainz/musicbrainz-server/blob/master/CONTRIBUTING.md
• https://github.com/metabrainz/guidelines/blob/master/GitHub.md

@reosarevok, I guess that we will wait for the decision to be taken in next Monday meeting before merging this change?

[reosarevok]

@yvanzo: I don't think we have to - Rob already said he wanted to do this. My meeting question is not "should these be the priority" but "are we planning to quit Twitter entirely" :)