List differences with standard Mastodon on the about/more page

[ghost]

It might be useful to people who are looking for a good home on Mastodon to know about the differences between witches.town and standard Mastodon instances. Things like the renamed/recolored interface parts and the increased characters/toot limit. Since the about/more page is the only information available before signing up, it's the right place to let newcomers know what to expect.

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• I searched or browsed the repo’s other issues to ensure this is not a duplicate.