Fix last rawgit link

Author: sbird

docs/source/class-docs.rst

@@ -5,6 +5,6 @@ There are several sources of information for users who wish to familiarize
 themselves with the CLASS code base. Some of these options incude:
 
 - `the CLASS website <http://class-code.net>`_
-- `the CLASS documentation <https://cdn.rawgit.com/lesgourg/class_public/master/doc/manual/html/index.html>`_
+- `the CLASS documentation <https://cdn.jsdelivr.net/gh/lesgourg/class_public@master/doc/manual/html/index.html>`_
 - `the CLASS GitHub <https://github.com/lesgourg/class_public>`_
 - `arXiv papers <http://lesgourg.github.io/class_public/class.html#papers>`_