Change channel banner to be CSS background image

This is to allow for contents to be placed on the channel banner itself;
something that is required for the links widget shown on Youtube.

assets/css/default.css

@@ -15,6 +15,16 @@ body {
   background-color: rgb(255, 0, 0, 0.5);
 }
 
+#channel-banner-container {
+  margin-bottom: 1em;
+}
+
+#banner {
+  height: calc(100vw / 6.2 - 1px);
+  background-size: cover !important;
+  background-repeat: no-repeat !important;
+}
+
 .channel-profile > * {
   font-size: 1.17em;
   font-weight: bold;

src/invidious.cr

@@ -1488,7 +1488,6 @@ get "/fetch_link_favicon" do |env|
         env.response.headers["Access-Control-Allow-Origin"] = "*"
         proxy_file(favicon_response, env)
       end
-
     rescue ex
     end
   end

src/invidious/channels/about.cr

@@ -195,6 +195,6 @@ def get_about_info(ucid, locale)
     allowed_regions:    allowed_regions,
     related_channels:   related_channels,
     tabs:               tabs,
-    links:              links
+    links:              links,
   })
 end

src/invidious/views/components/channel-information.ecr

@@ -4,8 +4,9 @@
 <% end %>
 
 <% if channel.banner %>
-    <div class="h-box">
-        <img style="width:100%" src="/ggpht<%= URI.parse(channel.banner.not_nil!.gsub("=w1060-", "=w1280-")).request_target %>">
+    <div class="pure-g" id="channel-banner-container">
+        <div class="pure-u-1" id="banner" style='background: url(/ggpht<%= URI.parse(channel.banner.not_nil!.gsub("=w1060-", "=w1280-")).request_target %>)'>
+        </div>
     </div>
 
     <div class="h-box">