* Add SQL query executor

* Move mermaid.min.js to static asset
* Create templates for sql logic

templates/partials/sql_explorer/schema.html

@@ -0,0 +1,7 @@
+<div class="overflow-auto" style="max-height: 80vh;">
+    <div class="mermaid" style="opacity: 0;" _="on load
+             mermaid.init(undefined, this)
+             set me.style.opacity to '1'">
+        {{ mermaid_code }}
+    </div>
+</div>