Add support for .dev.sh install-specific shell configuration

config/zshrc

@@ -137,6 +137,10 @@ then
   source ~/.cargo/env
 fi
 
+if [ -e ~/.dev.sh ]
+then
+  source ~/.dev.sh
+fi
 
 # Liz stuff lol
 # curl -fsSL https://icanhazdadjoke.com | lolcat