clean up scripts

.config/polybar/scripts/system-uptime-pretty.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+uptime --pretty | sed 's/up //' | sed 's/\ years\?,/y/' | sed 's/\ weeks\?,/w/' | sed 's/\ days\?,/d/' | sed 's/\ hours\?,\?/h/' | sed 's/\ minutes\?/m/'