removed already unused 'shell_prompt.sh'
Set Steam startup window to floating
for some reason it's not assigned a window class, so the line preceding
it doesn't do anything.
tmux.conf cleanup & set renumber-windows 1
added /usr/share/fonts/local to font path
Not a huge issue, but some apps like xfontsel weren't pulling fonts from
that path so I couldn't preview some fonts
various zshrc changes
-added PYTHONOPTIMIZE=1 to ranger alias
-changed pk9/15 back to p9/15
-aliased 'diff -u' to diff