add conditional buttons for mobile gitter

server/views/coursewares/showHTML.jade

@@ -38,7 +38,11 @@ block content
                         label.btn.btn-success#trigger-reset-modal
                             i.fa.fa-refresh
                                 |   Reset
-                        label.btn.btn-success#challenge-help-btn
+                        label.btn.btn-success.hidden-sm.hidden-md.hidden-lg
+                            a(href='//gitter.im/freecodecamp/help')
+                                i.fa.fa-medkit
+                                    |   Help
+                        label.btn.btn-success.hidden-xs#challenge-help-btn
                             i.fa.fa-medkit
                                 |   Help
                         label.btn.btn-success#trigger-issue-modal

server/views/partials/navbar.jade

@@ -11,8 +11,10 @@ nav.navbar.navbar-default.navbar-fixed-top.nav-height
                 a.learn-btn(href='#') Learn
             li
                 a(href='/map') Map
-            li
+            li.hidden-xs
                 a#nav-chat-btn(href='#' onclick="return false") Chat
+            li.visible-xs
+                a(href="//gitter.im/freecodecamp/freecodecamp" target="_blank") Chat
             li
                 a(href='/news', target='_blank') News
             li