Convert tabs to 4 spaces for consistency

This was probably my fault to begin with, as I'm a big fan of tabs.
My bad. It just occurred to that not only do I have my tabs set to 4
columns, but some people may have wonky formatting because of whichever
setting we have for our tabs.

sheets/dd

@@ -6,20 +6,20 @@ dd if=/dev/urandom of=/tmp/test.txt count=2 bs=512
 dd if=/dev/zero of=/dev/null bs=4KB &
 export dd_pid=`pgrep '^dd'`
 while [[ -d /proc/$dd_pid ]]; do
-	kill -USR1 $dd_pid && sleep 1
-	clear
+    kill -USR1 $dd_pid && sleep 1
+    clear
 done
 
 # Watch the progress of dd(1) with pv(1) and dialog(1), both of which can be
 # installed with the following command: apt-get install pv dialog
 (
-	pv -n /dev/zero | dd of=/dev/null bs=128M conv=notrunc,noerror
+    pv -n /dev/zero | dd of=/dev/null bs=128M conv=notrunc,noerror
 ) 2>&1 | dialog --gauge "Running dd command (cloning), please wait..." 10 70 0
 
 # Watch the progress of dd(1) with pv(1) and zenity(1), both of which can be
 # installed with the following command: apt-get install pv zenity
 (
-	pv -n /dev/zero | dd of=/dev/null bs=128M conv=notrunc,noerror
+    pv -n /dev/zero | dd of=/dev/null bs=128M conv=notrunc,noerror
 ) 2>&1 | zenity --title 'Running dd command (cloning), please wait...' --progress
 
 # Watch the progress of dd(1) with the built-in `progress` functionality, -

sheets/i3

@@ -101,17 +101,19 @@ bindsym $mod+4 workspace $ws4
 bindsym $mod+Shift+R exec custom-script-in-path.sh --flag1 --flag2
 bindcode 172 exec playerctl play-pause
 
-# Always execute code when i3 starts:
+# Execute code when i3 starts, but only once per session:
 exec --no-startup-id ~/.config/polybar/launch.sh
+# Always execute code when i3 starts, even if it's simply restarted:
+exec_always --no-startup-id ~/.config/polybar/launch.sh
 
 # One can make special modes (much like resize mode)
 set $gamingMode "gaming_mode"
 bindsym $mod+g mode $gamingMode
 mode $gamingMode {
-   # Insert declarations for this mode
-   # Useful when normal keybindings fight with keybindings of your games
-   # Don't forget to add option to return from this mode!
-   bindsym $mod+Escape mode default
+    # Insert declarations for this mode. Useful when normal keybindings fight
+    # with keybindings of your games. Don't forget to add option to return from
+    # this mode!
+    bindsym $mod+Escape mode default
 }
 
 # Move workspace between multiple monitors