Changed the link to the bbb image to be an absolute url (#353)

app/views/shared/_header.html.erb

@@ -17,8 +17,7 @@
 	<div class="container">
 		<div class="d-flex">
 			<%= link_to (current_user ? current_user.main_room : root_path), class: "header-brand" do %>
-				<%= image_tag(Rails.configuration.branding_image.blank? ? "logo_with_text.png" : Rails.configuration.branding_image,
-					class: "header-brand-img") %>
+				<%= image_tag(Rails.configuration.branding_image,class: "header-brand-img") %>
 			<% end %>
 
 			<div class="d-flex ml-auto">

app/views/user_mailer/password_reset.html.erb

@@ -17,7 +17,7 @@
 %>
   <div style="text-align:center; font-family:'Source Sans Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif">
     <div style="display:inline-block; background-color:#F5F7FB; border:1px solid #d3d3d3; padding: 25px 70px">
-      <%= image_tag(Rails.configuration.branding_image.blank? ? "logo_with_text.png" : Rails.configuration.branding_image) %>
+      <%= image_tag(Rails.configuration.branding_image) %>
 
       <h1 style="margin-bottom:30px">Password Reset</h1>
 

app/views/user_mailer/verify_email.html.erb

@@ -18,7 +18,7 @@
 
   <div style="text-align:center; font-family:'Source Sans Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif">
     <div style="display:inline-block; background-color:#F5F7FB; border:1px solid #d3d3d3; padding: 25px 70px">
-      <%= image_tag(Rails.configuration.branding_image.blank? ? "logo_with_text.png" : Rails.configuration.branding_image) %>
+      <%= image_tag(Rails.configuration.branding_image) %>
 
       <h1 style="margin-bottom:30px">Welcome to  <%= t('bigbluebutton') %>!,
         <%= @user[:name] %></h1>

config/application.rb

@@ -79,7 +79,7 @@ module Greenlight
     config.banner_message = ENV['BANNER_MESSAGE']
 
     # Configure custom branding image.
-    config.branding_image = ENV['BRANDING_IMAGE']
+    config.branding_image = ENV['BRANDING_IMAGE'] || "https://raw.githubusercontent.com/bigbluebutton/greenlight/master/app/assets/images/logo_with_text.png"
 
     # Enable/disable recording thumbnails.
     config.recording_thumbnails = (ENV['RECORDING_THUMBNAILS'] != "false")