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

site/docs/4.2/examples/starter-template/starter-template.css

@@ -0,0 +1,7 @@
+body {
+  padding-top: 5rem;
+}
+.starter-template {
+  padding: 3rem 1.5rem;
+  text-align: center;
+}