chore: update project dependencies and configuration

- Removed Tailwind CSS tag from the artchat project metadata.
- Updated @nuxtjs/mdc package version from ^0.19.1 to 0.19.2 in package.json.
- Added migrations_table and migrations_dir properties to the D1 database configuration in wrangler.jsonc.

package.json

@@ -16,7 +16,7 @@
     "@nuxt/eslint": "1.12.1",
     "@nuxt/ui": "^4.3.0",
     "@nuxthub/core": "0.10.4",
-    "@nuxtjs/mdc": "^0.19.1",
+    "@nuxtjs/mdc": "0.19.2",
     "@vueuse/core": "^14.1.0",
     "@vueuse/math": "^14.1.0",
     "better-sqlite3": "^12.5.0",