Update/cleanup files and dependency (#439)

* Remove Lighthouse CI's related scripts

* Remove @emmetio/css-parser package override

* Update postcss-nesting to version 14

* Update pnpm version override to latest version (10.33.0)

* Remove tailwind.config.cjs

Author: sakuhanachan

lighthouserc.json

@@ -23,11 +23,7 @@
 		"lint": "eslint ./src --fix",
 		"preinstall": "npx only-allow pnpm",
 		"compress-fonts": "node scripts/compress-fonts.js",
-		"test-font-compression": "node scripts/test-font-compression.js",
-		"lhci": "lhci",
-		"lighthouse": "lighthouse",
-		"performance:baseline": "node scripts/performance-baseline.js",
-		"performance:check": "node scripts/performance-check.js"
+		"test-font-compression": "node scripts/test-font-compression.js"
 	},
 	"dependencies": {
 		"@astrojs/check": "^0.9.8",
@@ -88,7 +84,6 @@
 		"@iconify-json/material-symbols": "^1.2.65",
 		"@iconify-json/mdi": "^1.2.3",
 		"@iconify-json/simple-icons": "^1.2.76",
-		"@lhci/cli": "^0.15.1",
 		"@rollup/plugin-yaml": "^4.1.2",
 		"@types/hast": "^3.0.4",
 		"@types/markdown-it": "^14.1.2",
@@ -105,17 +100,12 @@
 		"glob": "^13.0.6",
 		"globals": "^17.4.0",
 		"postcss-import": "^16.1.1",
-		"postcss-nesting": "^13.0.2",
+		"postcss-nesting": "^14.0.0",
 		"prettier": "^3.8.1",
 		"prettier-plugin-astro": "^0.14.1",
 		"prettier-plugin-svelte": "^3.5.1",
 		"svelte-eslint-parser": "^1.6.0",
 		"typescript-eslint": "^8.58.0"
 	},
-	"packageManager": "pnpm@10.22.0",
-	"pnpm": {
-		"overrides": {
-			"@emmetio/css-parser": "https://codeload.github.com/ramya-rao-a/css-parser/tar.gz/370c480ac103bd17c7bcfb34bf5d577dc40d3660"
-		}
-	}
+	"packageManager": "pnpm@10.33.0"
 }