Add more information to main index

Clean up main index and add all missing information from the wiki
page, so that we can start discontinuing the wiki content.

Change-Id: I250f0441994811d3ff949c08f81ecface53783a9

README.rst

@@ -7,6 +7,16 @@ answer questions that OpenStack operators have as they need to scale up
 and scale out, and help address some of the limitations operators
 encounter in large OpenStack clusters.
 
-Documentation for the Large Scale SIG is published at:
-https://docs.openstack.org/large-scale/
+The main activities of the SIG are to maintain the
+`Scaling Journey <https://docs.openstack.org/large-scale/journey/index.html>`_
+documentation, and produce the *Large Scale OpenStack* show on
+`Openinfra Live <https://openinfra.live>`_.
 
+To join the SIG, you can post on the
+`openstack-discuss <https://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-discuss>`_
+mailing-list using the *[largescale-sig]* prefix. You can also join the
+`Large Scale SIG meeting <https://eavesdrop.openstack.org/#Large_Scale_SIG_Meeting>`_
+on OFTC IRC. You can find past meeting logs
+`here <https://eavesdrop.openstack.org/meetings/large_scale_sig/>`_. We use this
+`etherpad <https://etherpad.openstack.org/p/large-scale-sig-meeting>`_
+to propose agenda items for the next meeting.

doc/source/index.rst

@@ -9,10 +9,3 @@ Contents:
    stories/index
    other/index
    contributor/index
-
-Indices and tables
-==================
-
-* :ref:`genindex`
-* :ref:`modindex`
-* :ref:`search`