Remove 3rd party promo/shareware

Installation.md

@@ -40,15 +40,3 @@ chmod -R a=,a+X,u+rw,g+r /opt/Lidarr
 ```
 4. Run lidarr as system service: [Autostart on Linux](https://github.com/lidarr/Lidarr/wiki/Autostart-on-Linux)
 5. Lidarr should be available on port 8686, for example: http://localhost:8686
-
-### Ubuntu / Automated PlexGuide Installer ###
-
-NOTE: PlexGuide Installs Docker on your Machine
-
-1. Install PlexGuide from [https://plexguide.com](https://plexguide.com) - [GITHUB](https://github.com/Admin9705/PlexGuide.com-The-Awesome-Plex-Server) on a Clean UB16/UB18 machine
-2. Select "Program Suite Installer"
-3. Type lidarr
-4. Lidarr will install in under 15 seconds
-5. Follow screen instructions on how to access (example lidarr - lidarr.domain.com, ipv4:8686, domain:8686)
-
-![](https://plexguide.com/news/wp-content/uploads/2018/08/Snip20180824_90.png)