chore: move content to exampleSite

* update dev and build command

chore: move contents to exampleSite

chore: add configs to exampleSite

chore: use tailwindcss/nesting

* add postcss-import
* move imports to the top

chore: add config for theme dev

chore: add compiled css

chore: fix last updated issue

chore: dont't ignore hugo_stats.json

chore: update index page layout

package.json

@@ -1,11 +1,10 @@
 {
   "devDependencies": {
-    "@tailwindcss/typography": "^0.5.9",
+    "@tailwindcss/nesting": "^0.0.0-insiders.565cd3e",
     "autoprefixer": "^10.4.14",
     "postcss": "^8.4.23",
     "postcss-cli": "^10.1.0",
     "postcss-import": "^15.1.0",
-    "postcss-nested": "^6.0.1",
     "prettier": "^2.8.8",
     "prettier-plugin-go-template": "^0.0.13",
     "tailwindcss": "^3.3.2"