refactor(docs/user): shorten top-level 'README.adoc'

Shorten the top-level 'README.adoc' file by moving the user
documentation into the 'docs/user' directory.

README.adoc

@@ -35,33 +35,6 @@ Manager].
 
 * link:docs/index.adoc[dotfiles(7)]
 
-== Packages
-
-|===
-| Packages | Description
-
-a|
-- {home-configurations-full}[`aarch64-darwin-full`]
-- {home-configurations-full}[`aarch64-linux-full`]
-- {home-configurations-full}[`x86_64-darwin-full`]
-- {home-configurations-full}[`x86_64-linux-full`]
-a| Uses all `modules`.
-|===
-
-== Examples
-:command-base: nix run nixpkgs#home-manager -- switch --flake {repository-flake-url}#
-
-To build the <<packages, packages>> directly from {repository}[upstream] using
-{home-manager}[`home-manager`], run one of the following commands:
-
-[,bash,subs="attributes"]
-----
-{command-base}aarch64-darwin-full
-{command-base}aarch64-linux-full
-{command-base}x86_64-darwin-full
-{command-base}x86_64-linux-full
-----
-
 == See Also
 
 {repository-star-history-src-dark}[GitHub Star History], {home-manager}[Home

docs/index.adoc

@@ -6,4 +6,5 @@ dotfiles - Documentation Overview
 
 == See Also
 
-link:../README.adoc[README], link:dev/index.adoc[dotfiles.dev(7)]
+link:../README.adoc[README], link:dev/index.adoc[dotfiles.dev(7)],
+link:user/index.adoc[dotfiles.user(1)]

docs/user/index.adoc

@@ -0,0 +1,9 @@
+= dotfiles.user(7)
+
+== Name
+
+dotfiles.user - User Documentation Overview
+
+== See Also
+
+link:../index.adoc[dotfiles(1)], link:usage.adoc[dotfiles.user.usage(7)]

docs/user/usage.adoc

@@ -0,0 +1,41 @@
+= dotfiles.dev.usage(7)
+:toc:
+
+== Name
+
+dotfiles.dev.usage - TODO: add
+
+== Description
+
+TODO: add
+
+== Home Manager Configurations
+
+|===
+| Packages | Description
+
+a|
+- {home-configurations-full}[`aarch64-darwin-full`]
+- {home-configurations-full}[`aarch64-linux-full`]
+- {home-configurations-full}[`x86_64-darwin-full`]
+- {home-configurations-full}[`x86_64-linux-full`]
+a| Uses all `modules`.
+|===
+
+== Examples
+:command-base: nix run nixpkgs#home-manager -- switch --flake {repository-flake-url}#
+
+To build the <<packages, packages>> directly from {repository}[upstream] using
+{home-manager}[`home-manager`], run one of the following commands:
+
+[,bash,subs="attributes"]
+----
+{command-base}aarch64-darwin-full
+{command-base}aarch64-linux-full
+{command-base}x86_64-darwin-full
+{command-base}x86_64-linux-full
+----
+
+== See Also
+
+link:index.adoc[dotfiles.user(7)]