User profiles tutorial (#425)

* docs: Add user-profiles tutorial

* tweak links to work in docs site and some wording

docs/tutorials/user-profiles.md

+
+## People resources 
+
+### What can I do with User Resources? 
+User profile pages and the ability to bookmark/favorite and search for users is also available as of now. See a demo of what they feels like from an end user viewpoint from around the 36 minute mark of [this September 2019 talk](https://youtu.be/Gr3-RfWn49A?t=36m00s) - so you could actually argue that this video snippet can work as an end user guide.
+
+### How do I enable User pages?
+
+The configuration to have `Users` available consists of:
+
+1. Enable the users profile page index and display feature by performing [this frontend configuration](../../frontend/docs/application_config#index-users)
+
+2. There are two different alternative ways to populate user profile data. You can either:
+
+    * Configure the Metadata service to a do a [live lookup](../../metadata/docs/configurations#user_detail_method-optional) in some directory service, like LDAP or a HR system.
+
+    * Setup ongoing ingest of user profile data as they onboard/change/offboard into Neo4j and Elasticsearch effectively caching it with the pros/cons of that (similar to what the Databuilder sample loader does from user CSV, see the “pre-cooked demo data” link in the [Architecture overview](../../architecture#databuilder)
+
+    !!! note
+        Currently, for both of these options Amundsen _only_ provides these hooks/interfaces to add your own implementation. If you build something you think is generally useful, contributions are welcome!
+
+3. Configure login, according to the [Authentication guide](../../authentication/oidc)
+

mkdocs.yml

@@ -65,6 +65,7 @@ nav:
     - 'Tutorials':
         - 'How to index the postgres database metadata': 'tutorials/index-postgres.md'
         - 'How to setup a preview client with Apache Superset': 'tutorials/data-preview-with-superset.md'
+        - 'How to setup user profiles': 'tutorials/user-profiles.md'
     - 'Deployment':
       - 'Authentication': 'authentication/oidc.md'
       - 'AWS ECS Installation': 'installation-aws-ecs/aws-ecs-deployment.md'