Remove links to elixir-lang-talk

Author: José Valim

_includes/important-links.html

@@ -4,7 +4,6 @@ <h3 class="widget-title">Join the Community</h3>
     <li><a class="spec" href="irc://irc.freenode.net/elixir-lang">#elixir-lang on freenode IRC</a></li>
     <li><a class="spec" href="https://elixir-slackin.herokuapp.com/">Elixir on Slack</a></li>
     <li><a class="spec" href="http://elixirforum.com">Elixir Forum</a></li>
-    <li><a class="spec" href="https://groups.google.com/group/elixir-lang-talk">elixir-talk mailing list</a></li>
     <li><a class="spec" href="https://twitter.com/elixirlang">@elixirlang on Twitter</a></li>
     <li><a class="spec" href="http://elixir.meetup.com">Meetups around the world</a></li>
     <li><a class="spec" href="https://github.com/elixir-lang/elixir/wiki">Wiki with events, resources and talks organized by the community</a></li>

getting-started/introduction.markdown

@@ -70,7 +70,6 @@ When going through this getting started guide, it is common to have questions, a
   * [#elixir-lang on freenode IRC](irc://irc.freenode.net/elixir-lang)
   * [Elixir on Slack](https://elixir-slackin.herokuapp.com/)
   * [Elixir Forum](http://elixirforum.com)
-  * [elixir-talk mailing list](https://groups.google.com/group/elixir-lang-talk)
   * [elixir tag on StackOverflow](https://stackoverflow.com/questions/tagged/elixir)
 
 When asking questions, remember these two tips:

getting-started/mix-otp/introduction-to-mix.markdown

@@ -41,7 +41,7 @@ In this chapter, we will create our first project using Mix and explore differen
 
 > Note: this guide requires Elixir v1.2.0 or later. You can check your Elixir version with `elixir -v` and install a more recent version if required by following the steps described in [the first chapter of the Getting Started guide](/getting-started/introduction.html).
 >
-> If you have any questions or improvements to the guide, please let us know in [our mailing list](https://groups.google.com/d/forum/elixir-lang-talk) or [issues tracker](https://github.com/elixir-lang/elixir-lang.github.com/issues) respectively. Your input is really important to help us guarantee the guides are accessible and up to date!
+> If you have any questions or improvements to the guide, please reach discussion channels such as the [Elixir Forum](https://elixirforum.com) or the [issues tracker](https://github.com/elixir-lang/elixir-lang.github.com/issues). Your input is really important to help us guarantee the guides are accessible and up to date!
 >
 > The final code for this guide is in [this repository](https://github.com/josevalim/kv_umbrella) and can be used as a reference.
 

getting-started/where-to-go-next.markdown

@@ -31,8 +31,6 @@ Elixir is an extensible and very customizable programming language thanks to its
 
 We have a [Learning](/learning.html) section that suggests books, screencasts and other resources for learning Elixir and exploring the ecosystem. There are also plenty of Elixir resources out there, like conference talks, open source projects, and other learning material produced by the community.
 
-Remember that in case of any difficulties, you can always visit the **#elixir-lang** channel on **irc.freenode.net** or send a message to the [mailing list](https://groups.google.com/group/elixir-lang-talk). You can be sure that there will be someone willing to help. To keep posted on the latest news and announcements, follow the [blog](/blog/) and follow the language development on the [elixir-core mailing list](https://groups.google.com/group/elixir-lang-core).
-
 Don't forget that you can also check the [source code of Elixir itself](https://github.com/elixir-lang/elixir), which is mostly written in Elixir (mainly the `lib` directory), or [explore Elixir's documentation](/docs.html).
 
 ## A byte of Erlang