[polybar] Add docker module and fix font issues

.config/polybar/scripts/network_usage

@@ -58,9 +58,9 @@ while true; do
             output="  0.01  0.01"
         fi
 
-        echo "$icon $output"
+        echo "$icon$output"
     else
-        echo "$icon --  --"
+        echo "$icon--  --"
     fi
 
     echo "$current_values">$COUNTER_FILE