chore: Update 'package.json' for npm provenance (#32)

Author: smockle

package.json

@@ -1,16 +1,23 @@
 {
   "name": "headingoffset-polyfill",
   "version": "0.0.0-development",
-  "description": "",
+  "description": "Polyfill for the 'headingoffset' attribute.",
   "main": "headingoffset-polyfill.js",
   "module": "headingoffset-polyfill.js",
   "type": "module",
   "scripts": {
     "test": "web-test-runner headingoffset-polyfill*.test.html --coverage --node-resolve"
   },
-  "keywords": [],
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/smockle/headingoffset-polyfill.git"
+  },
   "author": "Clay Miller <[email protected]> (https://www.smockle.com/)",
   "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/smockle/headingoffset-polyfill/issues"
+  },
+  "homepage": "https://github.com/smockle/headingoffset-polyfill#readme",
   "devDependencies": {
     "@esm-bundle/chai": "^4.3.4-fix.0",
     "@web/test-runner": "^0.19.0"