When only the general class is passed, instance will be set to the same value.
On Wayland the general class sets the `app_id`, while the instance class is ignored.
Alacritty looks for the configuration file at the following paths:
1. $XDG_CONFIG_HOME/alacritty/alacritty.yml
2. $XDG_CONFIG_HOME/alacritty.yml
3. $HOME/.config/alacritty/alacritty.yml
4. $HOME/.alacritty.yml
On Windows, the configuration file is located at %APPDATA%\alacritty\alacritty.yml.
• Joe Wilm <joe@jwilm.com>