Activate a window to indicate that we want initial focus when the
system uses startup notifications.

Fixes #6931.

The common naming is reverse DNS, and given that alacritty is using
alacritty.org it makes more sense to use org.alacritty instead of
old io.alacritty.

This removes the releases section to make the creation of new releases a
bit simpler.

Alacritty's description in the readme and manpage has always been a bit
overly aggressive in its marketing. This new updated text should more
accurately describe Alacritty's current state without pointlessly
agitating people.

Since Alacritty is now officially packaged by Fedora, it is no longer
necessary to provide this in the official repository.

This is only an update to the development version and does not represent
a stable release.

Since Alacritty should not be responsible for packaging and the
maintainers of the snap package have not kept it up to date, this
removes its configuration file.

Fixes #3628.