Minor cleanup pass.

- Run prettier over all HTML.
- Combine jquery and jquery-migrate scripts
- Remove unused WP emoji code.
- Remove unused WP comment script.
- Remove unused WP embed script.
- Add Umami analytics (self-hosted, privacy friendly analytics)

.prettierrc.json

@@ -0,0 +1,7 @@
+{
+    "printWidth": 100,
+    "tabWidth": 2,
+    "useTabs": true,
+    "singleQuote": false,
+    "trailingComma": "es5"
+}