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-systemd/.SRCINFO

@@ -0,0 +1,12 @@
+pkgbase = lidm-systemd
+	pkgdesc = A fully colorful customizable TUI display manager made in C. (systemd service files)
+	pkgver = 1.2.3
+	pkgrel = 1
+	url = https://github.com/javalsai/lidm
+	arch = any
+	license = GPL-3.0-only
+	provides = lidm-service
+	source = lidm-systemd-1.2.3-systemd::https://raw.githubusercontent.com/javalsai/lidm/v1.2.3/assets/services/systemd.service
+	sha256sums = e63464441a97102194994adc82159871ccd3f23d5e97224f21a460e4296364cc
+
+pkgname = lidm-systemd

assets/pkg/aur/lidm-systemd/.gitignore

@@ -0,0 +1,3 @@
+*
+!PKGBUILD
+!.SRCINFO

assets/pkg/aur/lidm-systemd/PKGBUILD

@@ -0,0 +1,17 @@
+# shellcheck disable=SC2034,SC2154,SC2164
+# Maintainer: javalsai <javalsai@proton.me>
+pkgname=lidm-systemd
+pkgver=1.2.3
+pkgrel=1
+pkgdesc="A fully colorful customizable TUI display manager made in C. (systemd service files)"
+provides=('lidm-service')
+arch=('any')
+url="https://github.com/javalsai/lidm"
+license=('GPL-3.0-only')
+source=("${pkgname}-${pkgver}-systemd::https://raw.githubusercontent.com/javalsai/lidm/v1.2.3/assets/services/systemd.service")
+sha256sums=('e63464441a97102194994adc82159871ccd3f23d5e97224f21a460e4296364cc')
+
+package() {
+    cd "$srcdir"
+    install -Dm0644 "${pkgname}-${pkgver}-systemd" "$pkgdir/usr/lib/systemd/system/lidm.service"
+}