Replaces mailing list contact point with Slack; removes Google+; adds GitHub

Fixes #145

Author: pgleeson

contacts.html

@@ -58,24 +58,38 @@ <h1>Contact us</h1>
 		</header>
 
 		<div class="container">
+            
 		    <div class="page-header">
-		  	<h1 style="float: left;">Join the discussion!</h1><i class="fa fa-edit fa-l" style="float: right;"></i>
+		  	<h1 style="float: left;">Join the discussion!</h1><i class="fa fa-slack fa-l" style="float: right;"></i>
 		  	<div class="clearer"></div>
 		    </div>
 		    <p class="lead">
-		  	The easiest way to follow our day-to-day activities is to join our <a href="https://groups.google.com/forum/#!forum/openworm-discuss" target="_blank">high volume mailing list</a> that we use as a way to keep our communications in the open.
-			We also have a <a href="https://groups.google.com/forum/#!forum/openworm" target="_blank">lower volume mailing list</a> we use for announcements and general discussion and inquiries.
+		  	We use Slack to communicate and coordinate our daily activities, you are welcome to join us! For an invitation, fill out <a href="https://goo.gl/3ncZWn" target="_blank">our volunteer application form</a>.
 		    </p>
 		    <div class="large-spacer"></div>
+            
+            
 		    <div class="page-header">
 		  	<h1 style="float: left;">Interact with us on social media!</h1><i class="fa fa-twitter fa-l" style="float: right;"></i>
 		  	<div class="clearer"></div>
 		    </div>
 		    <p class="lead">
 		  	For ongoing information about OpenWorm, please follow our <a href="http://blog.openworm.org/" target="_blank">blog</a> on tumblr.
-			You can also follow us and interact on <a href="https://twitter.com/OpenWorm" target="_blank">twitter</a>, <a href="https://plus.google.com/117948341754627144949/posts" target="_blank">Google+</a> and <a href="https://www.facebook.com/OpenWorm" target="_blank">Facebook</a> for more frequent updates.
+			You can also follow us and interact on <a href="https://twitter.com/OpenWorm" target="_blank">Twitter</a> and <a href="https://www.facebook.com/OpenWorm" target="_blank">Facebook</a> for more frequent updates.
 		    </p>
 		    <div class="large-spacer"></div>
+            
+            
+		    <div class="page-header">
+		  	<h1 style="float: left;">Follow the code!</h1><i class="fa fa-github fa-l" style="float: right;"></i>
+		  	<div class="clearer"></div>
+		    </div>
+		    <p class="lead">
+		  	You can follow ongoing developments in the various software development projects of OpenWorm on <a href="https://github.com/openworm/OpenWorm/milestones" target="_blank">GitHub</a>.
+		    </p>
+		    <div class="large-spacer"></div>
+            
+            
 		    <div class="page-header">
 			<h1 style="float: left;">Drop us a line!</h1><i class="fa fa-envelope fa-l" style="float: right;"></i>
 			<div class="clearer"></div>