Infrastructure: remove pinst (#2167)

This is only required for husky for publicly published NPM packages that others consume.
Marked package as private to match

package.json

@@ -3,6 +3,7 @@
   "version": "0.0.0",
   "description": "This repository maintains the WAI-ARIA Authoring Practices Guide. This is developed by the [ARIA Working Group](http://www.w3.org/WAI/ARIA/). The staff contact is [Michael Cooper](http://www.w3.org/People/cooper/). Please do not provide commit access to this repository without coordination.",
   "main": "index.js",
+  "private": true,
   "directories": {
     "example": "examples"
   },
@@ -21,9 +22,7 @@
     "test": "npm run lint && npm run regression",
     "vnu-jar": "java -jar node_modules/vnu-jar/build/dist/vnu.jar --filterfile .vnurc --no-langdetect --skip-non-html aria-practices.html examples/",
     "create-gh-project": "node ./scripts/create-gh-project.js",
-    "prepare": "husky install",
-    "prepublishOnly": "pinst --disable",
-    "postpublish": "pinst --enable"
+    "prepare": "husky install"
   },
   "repository": {
     "type": "git",
@@ -53,7 +52,6 @@
     "htmlparser2": "^7.2.0",
     "husky": "^7.0.4",
     "lint-staged": "^12.1.2",
-    "pinst": "^2.1.6",
     "prettier": "^2.4.1",
     "selenium-webdriver": "^4.1.0",
     "stylelint": "^14.1.0",