Enable the unicorn/prefer-modern-dom-apis ESLint plugin rule

This rule will help enforce slightly shorter code, and according to MDN both `Element.replaceWith()` and `Element.before()` are available in all browsers that we currently support.

Please find additional information here:
 - https://github.com/sindresorhus/eslint-plugin-unicorn/blob/main/docs/rules/prefer-modern-dom-apis.md
 - https://developer.mozilla.org/en-US/docs/Web/API/Element/replaceWith
 - https://developer.mozilla.org/en-US/docs/Web/API/Element/before

.eslintrc

@@ -53,6 +53,7 @@
     "unicorn/prefer-date-now": "error",
     "unicorn/prefer-dom-node-append": "error",
     "unicorn/prefer-dom-node-remove": "error",
+    "unicorn/prefer-modern-dom-apis": "error",
     "unicorn/prefer-string-starts-ends-with": "error",
 
     // Possible errors