Restructuring the Nix manual

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diff --git a/doc/manual/packages/one-click.xml b/doc/manual/packages/one-click.xml
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+<chapter xmlns="http://docbook.org/ns/docbook"
+      xmlns:xlink="http://www.w3.org/1999/xlink"
+      xmlns:xi="http://www.w3.org/2001/XInclude"
+      version="5.0"
+      xml:id="sec-one-click">
+
+<title>One-Click Installation</title>
+
+<para>Often, when you want to install a specific package (e.g., from
+the <link
+xlink:href="http://nixos.org/nixpkgs/">Nix
+Packages collection</link>), subscribing to a channel is a bit
+cumbersome.  And channels don’t help you at all if you want to install
+an older version of a package than the one provided by the current
+contents of the channel, or a package that has been removed from the
+channel.  That’s when <emphasis>one-click installs</emphasis> come in
+handy: you can just go to the web page that contains the package,
+click on it, and it will be installed with all the necessary
+dependencies.</para>
+
+<para>For instance, you can go to <link
+xlink:href="http://hydra.nixos.org/jobset/nixpkgs/trunk/channel/latest"
+/> and click on any link for the individual packages for your
+platform.  The first time you do this, your browser will ask what to
+do with <literal>application/nix-package</literal> files.  You should
+open them with <filename>/nix/bin/nix-install-package</filename>.
+This will open a window that asks you to confirm that you want to
+install the package.  When you answer <literal>Y</literal>, the
+package and all its dependencies will be installed.  This is a binary
+deployment mechanism — you get packages pre-compiled for the selected
+platform type.</para>
+
+<para>You can also install <literal>application/nix-package</literal>
+files from the command line directly.  See <xref
+linkend='sec-nix-install-package' /> for details.</para>
+
+</chapter>
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