chore: misc (#100) (this makes 2.0.0)

Co-authored-by: grialion <48643945+grialion@users.noreply.github.com>

- Fix license ambiguity (#88)
  - just the only/or-later ambiguity point, not adding SPDX identifyiers unless more people request it
- Better document kmscon (#91)
- Make 2.0.0 already to close #86
- Add a changelog
- Add packagers info (acutally just add them to install guide)
- Add AUR service packages (I'll take care of systemd and dinit, let others package the rest and leave systemd open for someone who actually uses it in docs)
- Make sure all makefile installs to `/usr/local` by default
- Simplify Makefile complexity by several orders

assets/pkg/aur/lidm/PKGBUILD

@@ -2,13 +2,13 @@
 # Maintainer: javalsai <javalsai@proton.me>
 pkgname=lidm
 pkgver=1.2.3
-pkgrel=3
-depends=('pam')
+pkgrel=5
+depends=('pam' 'lidm-service')
 makedepends=()
 pkgdesc="A fully colorful customizable TUI display manager made in C. (build latest tag)"
 arch=('any')
 url="https://github.com/javalsai/lidm"
-license=('GPL')
+license=('GPL-3.0-only')
 source=("${pkgname}-${pkgver}.tar.gz::https://github.com/javalsai/lidm/archive/refs/tags/v$pkgver.tar.gz")
 sha256sums=('1ce414b510c5bbc3e32ea882f915b4d3958cb82eb1fbb5cf33e62f69c844bf93')