Add tile servers as overlay
Could you make it possible to add tile servers as an overlay? I've manually added a hillshading layer into your code, but this would be gone after you release an update to gpxpod to the Nextcloud repository. Also, would it be hard to move the tile server configuration to a separate file which the server admin could modify himself? I'd like to remove some of the tile options that are currently available, but add a few/change the default for all users on my Nextcloud.
I'd love to help you on this, but I'm not a developer and haven't got any experience with JS.