Binary install instructions

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docs/binary.rst

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+kitty - Binary install
+========================
+
+.. |ins| replace:: curl -L :file:`https://sw.kovidgoyal.net/kitty/installer.sh` | sh /dev/stdin
+
+.. highlight:: sh
+
+You can install pre-built binaries of |kitty| if you are on macOS or Linux using
+the following simple command:
+
+.. parsed-literal::
+    :class: pre
+
+    |ins|
+    
+
+The binaries will be installed in the standard location for your OS,
+:file:`/Applications/kitty.app` on macOS and :file:`~/.local/kitty.app` on
+Linux. The installer only touches files in that directory. 
+
+
+Customizing the installation
+--------------------------------
+
+* You can specify a different install location, with ``dest``:
+
+  .. parsed-literal::
+     :class: pre
+
+     |ins| \\
+         dest=/some/other/location
+
+* You can tell the installer not to launch |kitty| after installing it with
+  ``launch=n``:
+
+  .. parsed-literal::
+     :class: pre
+
+     |ins| \\
+         launch=n
+
+* You can use a previously downloaded dmg/tarball, with ``installer``:
+
+  .. parsed-literal::
+     :class: pre
+
+     |ins| \\
+         installer=/path/to/dmg or tarball
+
+
+Manually installing
+---------------------
+
+If something goes wrong or you simply do not want to run the installer, you can
+manually download and install |kitty| from the `GitHub releases page
+<https://github.com/kovidgoyal/kitty/releases>`_. If you are on macOS, download
+the :file:`.dmg` and install as normal. If you are on Linux, download the tarball
+and extract it into a directory. The |kitty| executable will be in the
+:file:`bin` sub-directory.
+
+
+Building from source
+------------------------
+
+|kitty| is easy to build from source, follow the :doc:`instructions <build>`.