Add new variants to the firmware selector on the website

[PetruSoroaga]

On the public openIPC website, where the users can generate the install instructions for their SOC, there is a dropdown to select the variant: fpv, lite, ultimate, etc.
I would like to add there the variant rubyfpv, for the following SOC: sigmastar ssc338q, goke7205 v200, v210 and v300.
Those SOC do have a rubyfpv variant defined and working in the firmware repo.
Thank you.