alacritty: New default font size

Embiggened default font size in alacritty. I have come to really like it
(and don't need so much real estate at the moment), it shows off the
beauty of my dear Iosevka font, and lets the tmux bottom bar be flush
with my monitor.

Might change it back at some point, but for now it's perfect.

alacritty/.config/alacritty/alacritty.yml

@@ -7,9 +7,11 @@ scrolling:
   # scrollback is enabled (history > 0).
   multiplier: 3
 
+font:
+  size: 12.5
+
 # Allow terminal applications to change Alacritty's window title.
 window.dynamic_title: true
 
 import:
   - .config/alacritty/colorscheme.yml
-