feat(client:footer): modify footer

remove tyler's twitter. add gitter chat info. add open collective info. fix issues link.

[skip ci]

Author: Awk34

templates/app/client/components/footer/footer(html).html

@@ -1,6 +1,7 @@
 <div class="container">
   <p>Angular Fullstack v<%= rootGeneratorVersion() %> |
-    <a href="https://twitter.com/tyhenkel">@tyhenkel</a> |
-    <a href="https://github.com/DaftMonk/generator-angular-fullstack/issues?state=open">Issues</a>
+    <a href="https://gitter.im/DaftMonk/generator-angular-fullstack">Chat on Gitter</a> |
+    <a href="https://github.com/angular-fullstack/generator-angular-fullstack/issues?state=open">Issues</a> |
+    <a href="https://opencollective.com/angular-fullstack">Donate to our Open Collective</a>
   </p>
 </div>

templates/app/client/components/footer/footer(pug).pug

@@ -2,6 +2,8 @@
   p
     | Angular Fullstack v<%= rootGeneratorVersion() %>
     = ' | '
-    a(href='https://twitter.com/tyhenkel') @tyhenkel
+    a(href='https://gitter.im/DaftMonk/generator-angular-fullstack') Chat on Gitter
     = ' | '
-    a(href='https://github.com/DaftMonk/generator-angular-fullstack/issues?state=open') Issues
+    a(href='https://github.com/angular-fullstack/generator-angular-fullstack/issues?state=open') Issues
+    = ' | '
+    a(href='https://opencollective.com/angular-fullstack') Donate to our Open Collective