Fixing up random SteamDeck script UNTESTED, PLEASE TEST

[malkir]

• Remove all the >/dev/nulls that would also catch errors if something went wrong, replace with silent outputs and removal of verbosity
• Use heredocs instead of line-by-line shell scripts
• Clean up bash_profile modification
• Syntax cleanup
• Needless echos
• Most importantly: simplify over complicated uninstall bit that tries to specifically track a bunch of files, but then just runs a "rm -r ./usr" rendering the whole thing useless