change ribbon/icon color (#8926)
change ribbon/icon color (#8926)

* change ribbon color

related to #8096

- set the ribbon color for nightly to FF00FF
- set the icon color to gray scale for legacy

* - for legacy: let icon original
- Set ribbons in blue for debug, nightly, rc
- change text for rc to beta

Co-authored-by: bekuno <>
auricgoldfinger/cgeo,matej116/cgeo,cgeo/cgeo,auricgoldfinger/cgeo,S-Bartfast/cgeo,rsudev/c-geo-opensource,cgeo/cgeo,matej116/cgeo,tobiasge/cgeo,matej116/cgeo,cgeo/cgeo,tobiasge/cgeo,auricgoldfinger/cgeo,S-Bartfast/cgeo,rsudev/c-geo-opensource,rsudev/c-geo-opensource,S-Bartfast/cgeo,tobiasge/cgeo,cgeo/cgeo