Remove redundant Installation section from main README

Superseded by the new "Getting started" section, which is higher up and
gets more visibility.

README.md

@@ -155,7 +155,6 @@ Bots provide various additional functionality to your installation.
 
 Services that help you in administrating and monitoring your Matrix installation.
 
-
 | Name | Default? | Description | Documentation |
 | ---- | -------- | ----------- | ------------- |
 | [matrix-alertmanager-receiver](https://github.com/metio/matrix-alertmanager-receiver) | x | Prometheus' [Alertmanager](https://prometheus.io/docs/alerting/latest/alertmanager/) client | [Link](docs/configuring-playbook-alertmanager-receiver.md) |
@@ -184,11 +183,6 @@ Various services that don't fit any other categories.
 | [ntfy](https://ntfy.sh) | x | Push notifications server | [Link](docs/configuring-playbook-ntfy.md) |
 
 
-## Installation
-
-To configure and install Matrix on your own server, follow the [README in the docs/ directory](docs/README.md).
-
-
 ## Changes
 
 This playbook evolves over time, sometimes with backward-incompatible changes.