Geyser is actually cross platform, not just bedrock.
Also, dragonproxy is entirely abandoned in favour of geyser so removed all instances of dragonproxy and just left a msg saying use geyser in the top level readme.
I'm proposing this change as it will add an Environment Variable used by the EXILED (a Popular SCP:SL Mods Framework) to run its auto updater. Otherwise, the user could run into an issue with his server not starting.
I know this is normally not used to support modifications. But as this is only an environment variable I will propose the change anyway.