Revert "Update docs/quick-start.md: add the breadcrumb header"

This reverts commit 9a6e1cf14c.

As the quick start guide is standalone.

docs/quick-start.md

@@ -1,7 +1,5 @@
 # Quick start
 
-<sup>⚡️Quick start | [Prerequisites](prerequisites.md) > [Configuring your DNS settings](configuring-dns.md) > [Getting the playbook](getting-the-playbook.md) > [Configuring the playbook](configuring-playbook.md) > [Installing](installing.md)</sup>
-
 This page explains how to use this Ansible book in order to install Matrix services on your server with minimum core services.
 
 We will be using `example.com` as the "base domain" in the following instruction.