Update documentation (#1386)
Update documentation (#1386)

* Add headless install to complete installation guide as an option

* Reorganize structure

* Fix anchor link

* Correcting a few more issues

* Remove instructions to install Phoniebox with Desktop
MiczFlor/RPi-Jukebox-RFID,MiczFlor/RPi-Jukebox-RFID,MiczFlor/RPi-Jukebox-RFID,MiczFlor/RPi-Jukebox-RFID,MiczFlor/RPi-Jukebox-RFID