Replace outdated information on installation page

Repoint compatibilities to development information page instead.

Author: agjohnson

docs/development.rst

@@ -6,6 +6,8 @@ planning. Documentation authors can decide which theme release works best for
 their project based on required browser/operating system combinations or
 dependency support.
 
+.. _supported-browsers:
+
 Supported browsers
 ------------------
 
@@ -46,6 +48,8 @@ Opera (any OS, any version)
     **Community support only.** We do not receive enough traffic with this
     browser to officially support it in testing and development.
 
+.. _supported-dependencies:
+
 Supported dependencies
 ----------------------
 
@@ -57,6 +61,8 @@ The theme officially supports the following dependencies in your Sphinx project:
 
     * - Dependency
       - Versions
+    * - Python
+      - 2.7 or 3.6 or greater
     * - Sphinx
       - 1.7 up to at least 4.1
     * - docutils

docs/installing.rst

@@ -1,6 +1,5 @@
-************
 Installation
-************
+============
 
 Install the package (or add it to your ``requirements.txt`` file):
 
@@ -21,6 +20,12 @@ In your ``conf.py`` file:
 
     html_theme = "sphinx_rtd_theme"
 
+.. seealso::
+    :ref:`supported-browsers`
+        Officially supported and tested browser/operating system combinations
+
+    :ref:`supported-dependencies`
+        Officially Supported versions of Python, Sphinx, and other dependencies.
 
 .. note::
 
@@ -45,19 +50,3 @@ Symlink or subtree the ``sphinx_rtd_theme/sphinx_rtd_theme`` repository into you
 
     html_theme = "sphinx_rtd_theme"
     html_theme_path = ["_themes", ]
-
-Compatibility
-=============
-
-Python
-------
-
-``sphinx_rtd_theme`` requires Python 2.7 or Python 3.4 or greater.
-
-Sphinx
-------
-
-``sphinx_rtd_theme`` depends on at least Sphinx 1.6 although,
-we recommend at least Sphinx 2 to take advantage of the html5 writer.
-The html4 writer is still supported however,
-it is deprecated and support will be removed in the near future.