feat: add ESLint and update linting errors (#26)

* Install ESLint and Astro ESLint plugin

* Configure 2 plugins

* Improve ignore files

* Add lint script

* Install astro-eslint-parser

* Add parser and fix linting errors

package.json

@@ -12,7 +12,8 @@
     "format:check": "prettier --check .",
     "format": "prettier --write .",
     "cz": "cz",
-    "prepare": "husky install"
+    "prepare": "husky install",
+    "lint": "eslint ."
   },
   "dependencies": {
     "@astrojs/rss": "^2.1.0",
@@ -31,8 +32,12 @@
     "@tailwindcss/typography": "^0.5.9",
     "@types/github-slugger": "^1.3.0",
     "@types/react": "^18.0.27",
+    "@typescript-eslint/parser": "^5.50.0",
+    "astro-eslint-parser": "^0.11.0",
     "commitizen": "^4.3.0",
     "cz-conventional-changelog": "^3.3.0",
+    "eslint": "^8.33.0",
+    "eslint-plugin-astro": "^0.23.0",
     "husky": "^8.0.3",
     "lint-staged": "^13.1.0",
     "prettier": "^2.8.3",