Update Quarterly Status Report README

[salvadore]

Summary

• Make timeline clearer.
• Remove section 2): its content is now clearly included in section 0) just after the timeline.
• Merge section 1) and section 3) and sort their elements more consistently.
• Remove inexistent e-mail address for EuroBSDcon and explain that reports about it should be asked to people that went to it and not to the organization itself.