Update Wiki and remove redundant readme informations

[LoveBootCaptain]

Wiki should be updated by me

• RaspbianOS has issues - write a warning to use "buster"
• raspberry website moved some toutorials, update links
• install instructions should be updated
• remove redundant and somtimes old readme information and link to wiki instead

[useidel]

Have added some comments in #45 related to using later versions of Raspbian/RaspiOS Buster.