alacritty: Remove tmux integration

Removed autostarting of new tmux sessions for each new alacritty window.
The auto-closing and deluge of unnamed sessions did not help keep any
kind of organizational scheme, and lead to actual named sessions (like
notes, and dot) to perish under the mountain of sessions.

alacritty/.config/alacritty/alacritty.yml

@@ -351,8 +351,8 @@ live_config_reload: true
 #   - (macOS) /bin/bash --login
 #   - (Linux/BSD) user login shell
 #   - (Windows) powershell
-shell:
-  program: tmux
+# shell:
+#   program: tmux
 
 # Startup directory
 #