Integrate with systems for CFPs

[Igor Santos]

Simple systems for call for papers could be used easily, including their links with a custom icon, such as Call4Paperz or SpeakerFight. We should search for similar systems as well.

Additional tasks:

• find CFP systems used in the scientific world (reference: https://en.wikipedia.org/wiki/Abstract_management)
• study the possibility of implementing our own CFP system, using OpenCFP. It's MIT licensed and could be neatly integrated to the project, bringing a higher level of cohesion than external websites.