b44b8675149f74407842a5d2c0601638dc52d123
setting.Other and remove unused SHOW_FOOTER_BRANDING (#24270)
The `SHOW_FOOTER_BRANDING` came from year 2015, and it seems nobody ever
uses it. It only shows an GitHub icon which seems unrelated to Gitea, it
doesn't do what document says. So, remove it.
## ⚠️ Breaking
Users can now remove the key `[other].SHOW_FOOTER_BRANDING` from their
app.ini.
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