[Documentation] Create Archived folder for CNCF related docs

[lixuna]

Describe the update:

• to archive old documentation that is no longer relevant to CNTi

Describe why update is needed

• CNF WG (and CNCF’s related Cloud Native Telco efforts) has moved to LFN (see wiki)

Tasks

• [ ] create an archived folder
• [ ] archive Certified_CNF_Form.md
• [ ] archive Certified_CNF_Form.pdf
• [ ] archive Certified_CNF_Terms.md
• [ ] archive Certified_CNF_Terms.pdf