docs: Small updates and visual improvements of resulting HTML

Change-Id: Ic707fdb2625a6d4d9695c4d7f97b72e0617c1a6f
diff --git a/docs/INSTALL.rst b/docs/INSTALL.rst
index 00ee757..19ef042 100644
--- a/docs/INSTALL.rst
+++ b/docs/INSTALL.rst
@@ -1,3 +1,5 @@
+.. _Getting Started with ndn-cxx:
+
 Getting started with ndn-cxx
 ============================