Add Mastodon comments and remove date-fns dependency

package.json

@@ -17,13 +17,11 @@
     "@astrojs/tailwind": "^5.1.0",
     "@astropub/md": "^0.4.0",
     "@tailwindcss/typography": "^0.5.10",
-    "@types/he": "^1.2.3",
     "astro": "^4.5.4",
-    "date-fns": "^3.5.0",
     "github-slugger": "^2.0.0",
-    "he": "^1.2.0",
     "marked": "^12.0.1",
     "tailwindcss": "^3.4.1",
+    "tiny-decode": "^0.1.3",
     "typescript": "^5.4.2"
   },
   "devDependencies": {