chore: use pnpm to generate README parts

Author: Jason3S

package.json

@@ -9,7 +9,10 @@
   },
   "scripts": {
     "build": "tsc -p .",
-    "build:readme": "bash ./scripts/build-readme.sh",
+    "build:readme": "pnpm build:readme:help && pnpm build:readme:example && pnpm build:readme:inject && prettier -w README.md",
+    "build:readme:help": "./bin.mjs --help > static/help.txt",
+    "build:readme:example": "./bin.mjs \"*\" > static/example.txt",
+    "build:readme:inject": "inject-markdown README.md",
     "watch": "tsc -p . --watch",
     "coverage": "vitest run --coverage",
     "lint": "pnpm eslint && pnpm prettier",