* Adds pages to install drop-app on different platforms
* Removes rust-nightly-bin related instructions as they are not needed
* Adds ubuntu page
* Adds debian page
* Adds fedora guide
* Improves documentation to get umu-run to work on steamos and bazzite
* Fixes broken links
* Fixes the bazzite page
* Updates client link to latest version and removes rust-nightly-bin as a dependency on arch
* Few improvements
