feat: 🔧 update posts data file to use git created date for post publish date

src/posts/posts.json

@@ -1,6 +1,7 @@
 {
   "layout": "blogpost.njk",
   "permalink": "/posts/{{ title | slugify }}/",
+  "date": "git Created",
   "url": "https://blog.sebin-nyshkim.net",
   "author": {
     "name": "Sebin Nyshkim",