Add TOC to documentation, add readme.md notice

Adds TOC to architecture.md, getting-started.md, integrations.md and
user-guide.md

Updates README.md to add a notice that the files are best viewed on the
website.

docs/user-guide.md

@@ -1,16 +1,7 @@
 # User Guide
 
-- Command Line
-  - [Kompose Convert](#kompose-convert)
-  - [Kompose Up](#kompose-up)
-  - [Kompose Down](#kompose-down)
-
-- Documentation
-  - [Build and Push Docker Images](#build-and-push-docker-images)
-  - [Alternative Conversions](#alternative-conversions)
-  - [Labels](#labels)
-  - [Restart](#restart)
-  - [Docker Compose Versions](#docker-compose-versions)
+* TOC
+{:toc}
 
 Kompose has support for two providers: OpenShift and Kubernetes.
 You can choose a targeted provider using global option `--provider`. If no provider is specified, Kubernetes is set by default.