Add docs on removing edit button (#3479)

* Add docs on removing edit button

We don't have a great option for this currently. It should be a theme option,
but for now, here's the hack that removes all of the buttons.

* Update copy

Author: agjohnson

docs/guides/remove-edit-buttons.rst

@@ -0,0 +1,26 @@
+Removing "Edit on ..." Buttons from Documentation
+=================================================
+
+When building your documentation, Read the Docs automatically adds buttons at
+the top of your documentation that point readers to your repository to make
+changes. For instance, if your repository is on GitHub, a button that says "Edit
+on GitHub" is added to your documentation to make it easy for readers to author
+new changes.
+
+The only way to remove these links currently is to override the Read the Docs
+theme templates:
+
+* In your Sphinx project path, create a directory called ``_templates``. If you
+  use a different ``templates_path`` option in your ``conf.py``, substitute that
+  directory name.
+* Create a file in this path called ``breadcrumbs.html``
+
+The new ``breadcrumbs.html`` should look like this::
+
+    {%- extends "sphinx_rtd_theme/breadcrumbs.html" %}
+
+    {% block breadcrumbs_aside %}
+    {% endblock %}
+
+Now when you build your documentation, your documentation won't include an edit
+button or links to the page source.