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-bin/PKGBUILD

@@ -2,12 +2,12 @@
 # Maintainer: javalsai <javalsai@proton.me>
 pkgname=lidm-bin
 pkgver=1.2.3
-pkgrel=3
-depends=('libpam.so')
+pkgrel=4
+depends=('libpam.so' 'lidm-service')
 pkgdesc="A fully colorful customizable TUI display manager made in C. (release binary)"
 arch=('x86_64' 'i686' 'aarch64' 'armv7h' 'riscv64')
 url="https://github.com/javalsai/lidm"
-license=('GPL')
+license=('GPL-3.0-only')
 provides=('lidm')
 conflicts=('lidm')
 source=(