Remove donation section and add slack link

Author: st0012

public/index.html

@@ -34,16 +34,15 @@
         </a>
         <div class="nav-tabs">
           <a target="_blank" href="https://github.com/goby-lang/goby"><span>GitHub</span></a>
-          <a target="_blank" href="https://goby-lang.gitbooks.io/goby/content/"><span>GitBook</span></a>
           <a target="_blank" href="https://twitter.com/goby_lang"><span>Twitter</span></a>
-          <a target="_blank" href="https://www.producthunt.com/posts/goby-language"><span>ProductHunt</span></a>
         </div>
       </div>
     </nav>
 
     <div class="caption">
       <h2 id="caption-title">This Site's Server is 100% Written In Goby!</h2>        
       <h2 id="feature-title"><a href="https://goby-lang.gitbooks.io/goby/content/plugin-system.html">Check Out The Featured Plugin System</a></h2>        
+      <h2><a href="https://goby-slack-invite.herokuapp.com" target="_blank">Have any questions? Ask in our Slack!</a></h2>
     </div>
 
     <!-- Begin MailChimp Signup Form -->
@@ -75,13 +74,6 @@ <h4>Stay up to date on Goby's news</h4>
       <h2 id="cdn-title"><a href="https://www.keycdn.com" target="_blank">Accelerated by KeyCDN</a></h2>  
     </div>
 
-    <footer>
-      <div id="donate-section">
-        <h2>Support us with a monthly donation and help us continue our activities.</h2>
-        <a href="https://opencollective.com/goby" target="_blank">Become a Backer!</a>
-      </div>
-    </footer>
-
     <!-- Google Analytics -->
     <script>
       (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){