[Web] create a section on https://landscape.lfnetworking.org/ for Certified CNFs/products

[lixuna]

Describe the update:
create a section on https://landscape.lfnetworking.org/ for Certified CNFs/products

Describe why update is needed

• CNF WG (and CNCF’s related Cloud Native Telco efforts) has moved to LFN (see wiki)
• what we have now: "Certified CNFs" on https://landscape.cncf.io/?group=certified-partners-and-providers&view-mode=grid

Tasks

• Decide if we want to showcase certified products on the https://landscape.lfnetworking.org/
• Mock design ideas
• Request LFN web team to implement changes
• tbd