Infrastructure: Bump husky from 4.3.8 to 5.0.9 (pull #1756)

* Infrastructure: Bump husky from 4.3.8 to 5.0.9

Bumps [husky](https://github.com/typicode/husky) from 4.3.8 to 5.0.9.
- [Release notes](https://github.com/typicode/husky/releases)
- [Commits](typicode/husky@v4.3.8...v5.0.9)

Signed-off-by: dependabot[bot] <support@github.com>

* Migrate from Husky 4 to Husky 5

First, I used this tool:

https://github.com/typicode/husky-4-to-5

Then, per documentation at https://typicode.github.io/husky/
I moved pre-commit hooks from package.json into .husky/pre-commit

The command `lint-staged` by itself didn't work, it needs to be
prefixed with `npx`.

* Update husky again

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Simon Pieters <zcorpan@gmail.com>

.husky/.gitignore

@@ -0,0 +1 @@
+_

.husky/pre-commit

@@ -0,0 +1,4 @@
+#!/bin/sh
+. "$(dirname "$0")/_/husky.sh"
+
+npx lint-staged

package.json

@@ -20,7 +20,10 @@
     "regression-report": "node test/util/report",
     "test": "npm run lint && npm run regression",
     "vnu-jar": "java -jar node_modules/vnu-jar/build/dist/vnu.jar --errors-only --filterfile .vnurc --no-langdetect --skip-non-html aria-practices.html examples/",
-    "create-gh-project": "node ./scripts/create-gh-project.js"
+    "create-gh-project": "node ./scripts/create-gh-project.js",
+    "postinstall": "husky install",
+    "prepublishOnly": "pinst --disable",
+    "postpublish": "pinst --enable"
   },
   "repository": {
     "type": "git",
@@ -34,21 +37,22 @@
   "homepage": "https://github.com/w3c/aria-practices#readme",
   "devDependencies": {
     "ava": "^3.15.0",
+    "babel-eslint": "^10.1.0",
     "cheerio": "^1.0.0-rc.5",
     "cspell": "^5.2.4",
     "eslint": "^7.20.0",
     "eslint-config-prettier": "^7.2.0",
-    "babel-eslint": "^10.1.0",
     "eslint-plugin-ava": "^11.0.0",
     "eslint-plugin-jsdoc": "^32.1.0",
     "eslint-plugin-prettier": "^3.3.1",
     "geckodriver": "^1.22.1",
     "glob": "^7.1.6",
     "htmlhint": "^0.14.2",
     "htmlparser2": "^6.0.0",
-    "husky": "^4.3.8",
+    "husky": "^5.1.1",
     "lint-staged": "^10.5.4",
     "npm-merge-driver": "^2.3.6",
+    "pinst": "^2.1.4",
     "prettier": "^2.2.1",
     "selenium-webdriver": "^4.0.0-beta.1",
     "stylelint": "^13.11.0",
@@ -57,11 +61,6 @@
     "stylelint-prettier": "^1.1.2",
     "vnu-jar": "^21.2.5"
   },
-  "husky": {
-    "hooks": {
-      "pre-commit": "lint-staged"
-    }
-  },
   "lint-staged": {
     "*.css": [
       "stylelint --fix",