fix index of docs/install by moving to .rst

docs/install/index.rst

@@ -0,0 +1,28 @@
+======================
+Prerequisites for Flux
+======================
+
+All you need is a Kubernetes cluster and a git repo. The git repo
+contains `manifests <https://kubernetes.io/docs/concepts/configuration/overview/>`_
+(as YAML files) describing what should run in the cluster. Flux imposes
+:doc:`some requirements <../requirements>` on these files.
+
+Installing Weave Flux
+=====================
+
+Here are the instructions to :doc:`install Flux on your own
+cluster <./get-started>`.
+
+If you are using Helm, we have a :doc:`separate section about
+this <./helm-get-started>`.
+
+You can also configure a more advanced, :doc:`standalone
+setup <./standalone-setup>`.
+
+.. toctree::
+   :maxdepth: 1
+   :caption: Contents:
+
+   get-started
+   helm-get-started
+   standalone-setup