install-photobooth: remove preview options from main installer

[andi34]

• seperate installation of go2rtc preview from main installer
• remove preview via cameracontrol.py from main installer: Pi Camera user frequently used this option by accident
• added rpicam-apps and libcamera-apps support for go2rtc
• allow update of go2rtc
• allow to uninstall go2rtc and related services
• adjusted the FAQ and removed old workarounds for PiCamera
• update go2rtc, switch to official release (closes https://github.com/PhotoboothProject/photobooth/pull/705)
• rename go2rtc src from dslr to photobooth

[andi34]

To-do:

• [x] Adjust FAQ
• [ ] rename stream from DSLR to ????