Prep for v4.2.0 release

- Move 4.1 docs to 4.2
- Update versions everywhere to 4.1.3 with release script
- Manually bump the shorthand version in package.json
- Add 4.2 to the versions docs page
- Update some redirects
- Fix tests asset URLs
- Bump Nuget and more

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "bootstrap",
-  "version": "4.1.3",
+  "version": "4.2.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {