Initial commit: Grav CMS setup with HTML reference material

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/admin/themes/grav/app/tools/index.js

@@ -0,0 +1 @@
+import './logs';

plugins/admin/themes/grav/app/tools/logs.js

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+import $ from 'jquery';
+import { setParam } from 'mout/queryString';
+
+const prepareQuery = (key, value) => {
+    return setParam(global.location.href, key, value);
+};
+
+$(document).on('change', '.logs-content .block-select select[name]', (event) => {
+    const target = $(event.currentTarget);
+    const name = target.attr('name');
+    const value = target.val();
+
+    global.location.href = prepareQuery(name, value);
+});