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-dinit/PKGBUILD

@@ -0,0 +1,17 @@
+# shellcheck disable=SC2034,SC2154,SC2164
+# Maintainer: javalsai <javalsai@proton.me>
+pkgname=lidm-dinit
+pkgver=1.2.3
+pkgrel=1
+pkgdesc="A fully colorful customizable TUI display manager made in C. (dinit service files)"
+provides=('lidm-service')
+arch=('any')
+url="https://github.com/javalsai/lidm"
+license=('GPL-3.0-only')
+source=("${pkgname}-${pkgver}-dinit::https://raw.githubusercontent.com/javalsai/lidm/v1.2.3/assets/services/dinit")
+sha256sums=('185cd76c1d29ddc73cf96be999f13278a427bb80aa9169f25f30673ad2de3770')
+
+package() {
+    cd "$srcdir"
+    install -Dm0644 "${pkgname}-${pkgver}-dinit" "$pkgdir/etc/dinit.d/lidm"
+}