Custom sidebar with hierarchy

_Sidebar.md

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+# Table of content
+
+- [Home](/)
+- Setup
+  - [Synology setup](Synology-setup)
+  - [Testing the setup](Testing-the-setup)
+  - [Advanced setup](Advanced-setup)
+  - [External firewall](External-firewall)
+- FAQ
+  - [Docker image tags](Docker-image-tags)
+  - [Openvpn warnings](Openvpn-warnings)
+  - [Openvpn ping timeout](Openvpn-ping-timeout)
+  - [Openvpn killed](Openvpn-killed)
+  - [Portainer iptables error](Portainer-iptables-error)
+  - [Mullvad IPv6](Mullvad-IPv6)
+- [HTTP Control server](HTTP-Control-server)
+  - [Control Openvpn](Control-Openvpn)
+  - [Control DNS over TLS](Control-DNS-over-TLS)
+  - [Setup the HTTP control server](Setup-the-HTTP-control-server)
+- Servers
+  - [Cyberghost Servers](Cyberghost-Servers)
+  - [Surfshark Servers](Surfshark-Servers)
+  - [Updating Servers](Updating-Servers)
+- Contributing
+  - [Developement setup](Developement-setup)
+  - [Development commands](Development-commands)
+  - [Development guidelines](Development-guidelines)
+- [More information](More-information)