|Title||Drop the "site icons" feature|
There is a annicient and now hidden feature "site icons". The user can set the option use_siteicons = True in the multisite.mk and put an icon named like this into the images/icons directory: icons/site-%s-24.png. This can currently not be configured via WATO. Remove this feature, because this can be configured using the custom host/service icon feature these days via WATO.