* Prevent Firefox from using apple-touch-icon
The opaque background does not work well in Firefox which uses the icon
as a "rich icon". Prevent this by not specifying it in HTML. Real Apple
devices will still request the icon on the static path.
Fixes: https://github.com/go-gitea/gitea/issues/10394
Also adjust gitignore so app.ini.sample becomes searchable and fixed a
variable name in app.ini.sample.
* fix gitignore