remove references to Arch Linux

Cargo.toml

@@ -2,7 +2,7 @@
 name = "pacdef"
 version = "1.0.0-beta9"
 edition = "2021"
-description = "declarative package manager for Arch Linux"
+description = "declarative package manager for Linux"
 license = "GPL-3.0-or-later"
 repository = "https://github.com/steven-omaha/pacdef"
 readme = "README.md"

TODO.md

@@ -5,6 +5,5 @@
 - change version names (1.0.0-beta.10)
 - make table use section header with brackets
 - tutorial
-- remove "Arch" references
 - update README for subcommands "group", "package"
 - update completion for new subcommands