Switch from Xmonad to DWM, MangoHud Config Changes, & Fallout Grub Theme

- Change "~" to "=" in some places in README.org
- Update MangoHud config to show info about RAM, Disk, GPU, etc.
- Switch from xmonad to dwm
- Add dwm-flexipatch submodule
- Add fallout grub theme submodule
- Add notifications to session control script
- Remove nyrna from autostart
- Add Bauh package management GUI to autostart
- Comment out turning picom off when starting game
  since it stops when a program goes fullscreen now

.gitmodules

@@ -66,3 +66,9 @@
 	path = .themes/dracula-qbittorrent
 	url = git@github.com:dracula/qbittorrent.git
     branch = master
+[submodule ".config/dwm-flexipatch"]
+	path = .config/dwm-flexipatch
+	url = git@github.com:balajsra/dwm-flexipatch.git
+[submodule ".themes/fallout-grub-theme"]
+	path = .themes/fallout-grub-theme
+	url = git@github.com:shvchk/fallout-grub-theme.git