Move all bergamot partials and shortcodes into theme

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

layouts/shortcodes/bergamot_widget.html

@@ -0,0 +1,8 @@
+<div id="{{ .Get "id" }}"></div>
+<script>
+    window.addEventListener('load', function() {
+        window.Bergamot.run(null, '{{ .Get "id" }}',
+            {{ partial "bergamotparseinputmodes.js" (.Get "modes") | safeJS }},
+            '{{ .Get "prompt" }}', '{{ .Inner }}', '{{ default "default" (.Get "rendering") }}', '{{ .Get "query" }}');
+    });
+</script>