Add some partials to load and create a Bergamot widget.

I've set up some infrastructure to build and host a bergamot JS
file using Nix on static.danilafe.com.

Signed-off-by: Danila Fedorin <danila.fedorin@gmail.com>

layouts/shortcodes/bergamot_widget.html

@@ -0,0 +1,7 @@
+<div id="{{ .Get "id" }}"></div>
+<script>
+    var app = Elm.Main.init({
+        node: document.getElementById('{{ .Get "id" }}'),
+        flags: { rules: '{{- strings.Trim .Inner " \n" -}}', query: '{{ .Get "query" }}' }
+    });
+</script>