major overhaul, including:

* builds with echo now instead of gin
* beginning of web UI
* factor out util functions

view/navbar.html

@@ -0,0 +1,16 @@
+<!-- Navigation -->
+  <nav class="navbar navbar-expand-lg navbar-dark bg-dark static-top">
+    <div class="container">
+      <a class="navbar-brand" href="/">Fediverse Index</a>
+      <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
+        <span class="navbar-toggler-icon"></span>
+      </button>
+      <div class="collapse navbar-collapse" id="navbarResponsive">
+        <ul class="navbar-nav ml-auto">
+          <li class="nav-item">
+            <a class="nav-link" href="https://sneak.berlin">Author</a>
+          </li>
+        </ul>
+      </div>
+    </div>
+  </nav>