Delete files and GitHub action job related to releasing the AUR packages #309

Job	Run time
Build (x86_64-unknown-linux-gnu, normal)	2m 37s
Clippy (ubuntu-latest)	23s
Rustfmt	24s
Build (i686-unknown-linux-gnu, normal)	2m 59s
Clippy (windows-latest)	5m 9s
Build (aarch64-unknown-linux-gnu, normal)	3m 5s
Clippy (windows-latest)	4m 36s
Build (armv7-unknown-linux-gnueabihf, normal)	2m 48s
Clippy (macos-latest)	37s
Build (x86_64-pc-windows-msvc, normal)	5m 38s
Build (i686-pc-windows-msvc, normal)	9m 7s
Build (x86_64-pc-windows-msvc, portable)	8m 40s
Release on packagecloud.io	0s
Release on GitHub	0s
Release on Windows Package Manager	0s
Release on Gentoo GURU	0s
Release on Chocolatey	0s
	46m 3s

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