Migrated and updated process from wiki

Previous home was http://hackerspacesg.pbworks.com/w/page/44367892/Arranging-Events
minor edits to membership tiers, payment info and guest policy
added link to Google Groups on FAQ; other minor style edits
added section on personal belongings; changed "Guest Policy" to "Guests"
Merge pull request #75 from ValentineC/master

membership and FAQ edits, including new section on personal belongings
Merge pull request #74 from miccheng/misc-style-updates

Misc style updates
Merge pull request #72 from rolandturner/arranging-events

Migrated and updated process from wiki
Fix scroll postion bug when navigating through the pages.
Style footer and adjust typography in mobile view.