John ui fix issue#256 (#257)

Greenlight Homepage should display "Welcome to BigBlueButton", "powered by Greenlight"

app/assets/stylesheets/main.scss

@@ -63,3 +63,9 @@
   -webkit-background-clip: text;
   -webkit-text-fill-color: transparent;
 }
+
+.blue-grad {
+  background: linear-gradient(to right, rgba(65,105,225,1) 0%,  rgba(0,0,225,1) 100%);
+  -webkit-background-clip: text;
+  -webkit-text-fill-color: transparent;
+}

app/views/main/index.html.erb

@@ -25,7 +25,7 @@
   <div class="row pb-8">
     <div class="col-md-8 col-sm-12">
       <p id="main-text" class="font-weight-400 display-4"><%= t("landing.welcome").html_safe %></p>
-      <p class="text-muted h4" style="line-height: 22px;"><%= t("landing.about", href: link_to(t("bigbluebutton"), "http://bigbluebutton.org/", target: "_blank", class: "text-blue")).html_safe %></p>
+      <p class="text-muted h4" style="line-height: 22px;"><%= t("landing.about", href: link_to(t("greenlight"), "https://bigbluebutton.org/2018/07/09/greenlight-2-0/", target: "_blank", class: "text-green")).html_safe %></p>
       <br>
       <%= link_to "https://youtu.be/Hso8yLzkqj8", target: "_blank" do %>
         <h4><%= t("landing.video") %> <i class="far fa-play-circle"></i></h4>

app/views/shared/_footer.html.erb

@@ -14,6 +14,6 @@
 %>
 
 <footer class="footer pt-3">
-  <h5 class="text-center mb-1"><%= t("footer.powered_by", href: link_to(t("bigbluebutton"), "http://bigbluebutton.org/", target: "_blank", class: "text-blue")).html_safe %></h5>
+  <h5 class="text-center mb-1"><%= t("footer.powered_by", href: link_to(t("greenlight"), "https://bigbluebutton.org/2018/07/09/greenlight-2-0/", target: "_blank", class: "text-green")).html_safe %></h5>
   <p class="text-center pb-0">v <%= Greenlight::Application::VERSION %></p>
 </footer>