Add 'contents' section at the top of the page

These links wrap a <button> tag and use the "btn" class. To distinguish them from the command buttons that trigger the modals, I've given them a different colour scheme and a different emoji prefix.

css/css.css

@@ -14,6 +14,7 @@ h2 {
 .select-from {
   font-size: 16px;
 }
+
 code {
   word-break: break-all;
   word-wrap: break-word;
@@ -85,6 +86,18 @@ div {
   transform: scale(1.3) translateZ(0);
 }
 
+.contents-list {
+  color: black;
+}
+
+.contents-list:hover {
+  color: #2a9fd6;
+}
+
+.contents-list:before {
+  content: "📼"
+}
+
 .codeblock {
   font-family: monospace
   padding: 2px 4px;