Create a contact section in header

contact:  # optional
  email: <jlrda@dix-huitieme-siecle.fr>
  address: Six feet under the carrefour de Chateaudun-Place Kossuth
  phone: +33 1 01
social:  # optional
  - icon: github
    url: https://www.github.com/jlrda
    color: white
  - icon: researchgate
    url: https://www.researchgate.com/jlrda
    color: white

• Use it in footer
• test it
• Update the doc accordingly