Resolve "Create "partners" page"

Added partners page and links from main page https://hifis-review-app.hzdr.de/review-apps/hifis-hifis-net/24-partners-page/

@SpickerHZB @frust45 can you please check if we should add more partners?

@frust45 can you please check to what you thought could be done with the thick blue bar on the front page?

Thanx