Update content for SAMIoT 2020 Conference (Revision 1.1)-Target June 8

For this revision, we would to update the website as follow:

• Link to registration (June 8) - in Location section (@susan will provide the link)
• Add CFP and Submission Guidelines as hugo pages (@phkrief will provide the expected layout)
• TPC updates (more people) - A complete list should be available June 2
• Add link to Code of Conduct - @annejacko will provide the link.

Thanks a lot