docs: how to install without generated resources (#713)

* docs: add getting started with no generated resources and KMS recovery workflow

* Update website/content/docs/installing/no-gen-resources.mdx

Co-authored-by: Jeff Mitchell <jeffrey.mitchell@gmail.com>

Co-authored-by: Jeff Mitchell <jeffrey.mitchell@gmail.com>

website/data/docs-navigation.js

@@ -13,7 +13,7 @@ export default [
   },
   {
     category: 'installing',
-    content: ['systemd', 'postgres', 'high-availability'],
+    content: ['no-gen-resources', 'systemd', 'postgres', 'high-availability'],
   },
   {
     category: 'api-clients',