[feat] allow customization of logo and favicon #4101
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What does this PR do?
It allows for an instance administrator to configure a custom logo and favicon in settings.yml
Why is this change important?
This feature has been requested in #3208, and based on the number of thumbs up emojis, is wanted by several people (although I guess it's not that important)
How to test this PR locally?
Set the custom_files.* options in settings.yml
Related issues
Closes #3208
Sorry if there are a lot of issues with this, it's my first ever PR :)