Add youtube videos to docs

This is possible thanks to a custom youtube tag. See
https://jasonstitt.com/youtube-in-restructured-text

README.rst

@@ -71,19 +71,10 @@ Extensive documentation is available online: https://docs.tutor.overhang.io/
 Support
 -------
 
-To get community support, go to the official discussion forums: https://discuss.overhang.io.
+To get community support, go to the official discussion forums: https://discuss.overhang.io. For official support, please subscribe to a Long Term Support (LTS) license at https://overhang.io/tutor/lts.
 
 .. _readme_support_end:
 
-.. _whats_tutor_start:
-
-What is Tutor?
---------------
-
-Tutor was presented at the 2019 Open edX conference in San Diego, CA. Here's the 7-minute talk: `video <https://www.youtube.com/watch?v=Oqc7c-3qFc4>`_, `slides <https://regisb.github.io/openedx2019/>`_.
-
-.. _whats_tutor_end:
-
 .. _readme_contributing_start:
 
 Contributing

docs/conf.py

@@ -194,14 +194,50 @@
 epub_exclude_files = ['search.html']
 
 # Custom variables
-import io
-import os
 here = os.path.abspath(os.path.dirname(__file__))
 about = {}
-with io.open(os.path.join(here, "..", "tutor", "__about__.py"), "rt", encoding="utf-8") as f:
+with io.open(
+    os.path.join(here, "..", "tutor", "__about__.py"), "rt", encoding="utf-8"
+) as f:
     exec(f.read(), about)
 rst_prolog = """
 .. |tutor_version| replace:: {}
 """.format(
-    about['__version__'],
+    about["__version__"],
 )
+
+
+# Custom directives
+def youtube(
+    _name,
+    _args,
+    _options,
+    content,
+    _lineno,
+    _contentOffset,
+    _blockText,
+    _state,
+    _stateMachine,
+):
+    """ Restructured text extension for inserting youtube embedded videos """
+    if not content:
+        return []
+    video_id = content[0]
+    return [
+        docutils.nodes.raw(
+            "",
+            """
+<iframe width="560" height="315"
+    src="https://www.youtube-nocookie.com/embed/{video_id}"
+    frameborder="0"
+    allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen>
+</iframe>""".format(
+                video_id=video_id
+            ),
+            format="html",
+        )
+    ]
+
+
+youtube.content = True
+docutils.parsers.rst.directives.register_directive("youtube", youtube)

docs/intro.rst

@@ -10,16 +10,19 @@ Tutor simplifies the deployment of Open edX by:
 1. Separating the configuration logic from the deployment platforms.
 2. Running application processes in cleanly separated `docker containers <https://www.docker.com/resources/what-container>`_.
 
-.. image:: https://overhang.io/images/openedx-plus-docker-is-tutor.png
+.. image:: https://overhang.io/static/img/openedx-plus-docker-is-tutor.png
   :alt: Open edX + Docker = Tutor
   :width: 500px
   :align: center
 
 Because Docker containers are becoming an industry-wide standard, that means that with Tutor it becomes possible to run Open edX anywhere: for now, Tutor supports deploying on a local server, with `docker-compose <https://docs.docker.com/compose/overview/>`_, and in a large cluster, with `Kubernetes <http://kubernetes.io/>`_. But in the future, Tutor may support other deployment platforms.
 
-.. include:: ../README.rst
-    :start-after: _whats_tutor_start:
-    :end-before: _whats_tutor_end:
+What is Tutor?
+--------------
+
+Tutor was presented at the 2019 Open edX conference in San Diego, CA. Here's the 7-minute talk (with `slides <https://regisb.github.io/openedx2019/>`_):
+
+.. youtube:: Oqc7c-3qFc4
 
 How does Tutor work?
 --------------------