Split README into a bunch of files in docs/

docs/configuring-playbook.md

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+# Configuration the Ansible playbook
+
+Once you have your server and you have [configured your DNS records](configuring-dns.md#configuring-dns), you can proceed with configuring this playbook, so that it knows what to install and where.
+
+You can follow these steps:
+
+- create a directory to hold your configuration (`mkdir inventory/host_vars/matrix.<your-domain>`)
+
+- copy the sample configuration file (`cp examples/host-vars.yml inventory/host_vars/matrix.<your-domain>/vars.yml`)
+
+- edit the configuration file (`inventory/host_vars/matrix.<your-domain>/vars.yml`) to your liking. You may also take a look at `roles/matrix-server/defaults.main.yml` and see if there's something you'd like to copy over and override in your `vars.yml` configuration file.
+
+- copy the sample inventory hosts file (`cp examples/hosts inventory/hosts`)
+
+- edit the inventory hosts file (`inventory/hosts`) to your liking
+
+
+For a basic Matrix installation, that's all you need.
+For a more custom setup, see the [Other configuration options](#other-configuration-options) below.
+
+When you're done with all the configuration you'd like to do, continue with [Installing](installing.md).
+
+
+## Other configuration options
+
+- [Amazon S3 configuration](configuring-playbook-s3.md) (optional)
+
+- [Using an external PostgreSQL server](configuring-playbook-external-postgres.md) (optional)
+
+- [Using your own webserver, instead of this playbook's nginx proxy](configuring-playbook-own-webserver.md) (optional)