Inherit tech sidebar topic headings.

Modified the build script and sidebar template so that the sidebar
can be constructed from two parts.  sidebar.md provides the first
part and sidebar2.md provides the second level part.

Now the tech topics don't need to duplicate the main topic list in
their own sidebars.

Also added Mac installation instructions to the README.

Change-Id: Iea6a169e00159deb9b2e78cfd5291d2ad6f17147
diff --git a/README b/README
index 3af3a07..cb443f0 100644
--- a/README
+++ b/README
@@ -37,9 +37,11 @@
 % sudo apt-get install python-markdown
 
 For Mac:
-Eh, haven't tried this yet, not sure. But it should be enough to just install
-Python Markdown by hook or crook and make sure it's in your PATH.
-http://www.freewisdom.org/projects/python-markdown/
+$ sudo easy_install ElementTree
+$ sudo easy_install Markdown
+
+More information here:
+http://www.freewisdom.org/projects/python-markdown/Installation
 
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