Added contact page and other minor changes.

Refs idaholab#156

doc/config.yml

@@ -27,9 +27,9 @@ Renderer:
             User: manuals/user/index.md
         Documentation:
             Syntax: syntax/index.md
-            Interfaces: interfaces/index.md
         Help:
             FAQ: help/faq.md
+            Contact: help/contact_us.md
 
 Extensions:
     appsyntax:

doc/content/getting_started/running_mastodon.md

@@ -12,7 +12,10 @@ that defines the parameters of the run.  This text file specifies the
 set of code objects that are composed together to simulate a physical
 problem, and provides parameters that control how those objects behave
 and interact with each other.  This text file can be prepared using any
-text editor.
+text editor. The free and opensource [Atom](http://atom.io) text editor has
+several packages that help with creating MOOSE and MASTODON input files. Please
+read this [article](development/atomio.md) about using Atom for writing
+MASTODON input files.
 
 In addition to the text file describing the model parameters, MASTODON also
 requires a definition of the finite element mesh on which the physics

doc/content/help/contact_us.md

@@ -0,0 +1,18 @@
+# Contact Us
+
+## Mailing list
+
+The best way to contact the MASTODON team is through the [mastodon-users google group](https://groups.google.com/forum/#!forum/mastodon-users).
+
+To join the group, GMail users can just click the "Join group" button.
+Non-GMail users must send an email to:
+
+[[email protected]](mailto:[email protected])
+
+!alert! note
+INL users using their `inl.gov` email will not be able to post in the group,
+but will be able to receive emails and view existing posts. Instead, they can
+create new by sending an email to
+[[email protected]](mailto:[email protected]).
+Alternatively, they can join this group using a non-INL email address.
+!alert-end!