Fix links to documentation.

Add some notes about how to edit docs.

docs/README.md

@@ -6,6 +6,17 @@ This directory will contain the user and feature documentation for Prophet. The
 
 See [CONTRIBUTING.md](./CONTRIBUTING.md) for details on how to add or modify content.
 
+## Jupyter Notebooks
+
+Most of the `doc` pages are generated from [Jupyter notebooks](http://jupyter.org/) in the [notebooks](https://github.com/facebookincubator/prophet/tree/master/notebooks) directory at the base of the source tree.  Please make changes there and then rebuild the docs:
+
+```
+$ cd docs
+$ make notebooks
+```
+
+Make sure you have installed [rpy2](https://rpy2.bitbucket.io/) so that the R code can be run as well.
+
 ### Run the Site Locally
 
 The requirements for running a GitHub pages site locally is described in [GitHub help](https://help.github.com/articles/setting-up-your-github-pages-site-locally-with-jekyll/#requirements). The steps below summarize these steps.

docs/_docs/contributing.md

@@ -12,3 +12,14 @@ We appreciate all contributions. If you are planning to contribute back bug-fixe
 If you plan to contribute new features or extensions to the core, please first open an issue and discuss the feature with us. Sending a pull request is fine, too, but if it is a large change we suggest you run it by us first.
 
 We require that any API changes or feature additions are made available for both Python and R in parallel.
+
+## Documentation
+
+Most of the `doc` paages are generated from [Jupyter notebooks](http://jupyter.org/) in the [notebooks](https://github.com/facebookincubator/prophet/tree/master/notebooks) directory at the base of the source tree.  Please make changes there and then rebuild the docs:
+
+```
+$ cd docs
+$ make notebooks
+```
+
+Make sure you have installed [rpy2](https://rpy2.bitbucket.io/) so that the R code can be run as well.

docs/_includes/doc.html

@@ -18,7 +18,7 @@
     {% else %}
       {{ content }}
 
-      <p><a class="edit-page-link" href="https://github.com/{{ site.ghrepo }}/tree/gh-pages/{{ page.path }}" target="_blank">Edit on GitHub</a></p>
+      <p><a class="edit-page-link" href="https://github.com/{{ site.ghrepo }}/blob/master/docs/{{ page.path }}" target="_blank">Edit on GitHub</a></p>
     {% endif %}
   </article>
   {% include doc_paging.html %}