Migrate remote installation guide from VNC to RDP

With Anaconda change to switch from XWayland to native Wayland, the Anaconda also switched from VNC to RDP. Let's update this guide to reflect reality.

https://fedoraproject.org/wiki/Changes/Anaconda_As_Native_Wayland_Application

What changed:
- Switching VNC to RDP
- Change of the naming convention "VNC viewer" -> "RDP client"
- Drop of vnc connect mode (RDP doesn't support that)
- Change the port used for the RDP
- Drop the kickstart workaround because kickstart is not supported

The kickstart support was not implemented because we are not aware of the utilization. It can be added back if there are requests on that.