d44e1565da
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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|---|---|---|
| .. | ||
| alert.tmpl | ||
| alert_details.tmpl | ||
| delete_modal_actions.tmpl | ||
| disable_form_autofill.tmpl | ||
| footer.tmpl | ||
| footer_content.tmpl | ||
| head.tmpl | ||
| head_navbar.tmpl | ||
| head_script.tmpl | ||
| paginate.tmpl | ||