Updates to Melbourne page

[justinfrench]

• Remove specific date of next melbourne meet -- we shouldn't need to spoon-feed grown adults, it's always the last Thrusday of the month, which is exactly what the paragraph above says
• Remove links to previous meeting notes -- little value, lots of work, already out of date
• Add @dgoodlad as a co-organiser :D
• Add how to contact organisers
• Add add sponsors