centred PayPal link
added em-dashes and dollar symbols to membership rates for better readability
added library link, minor content edits, removed "current plans"
changed PayPal link from centre to 45px left padding; removed library link
added 10px bottom padding to PayPal link
Merge branch 'master' of github.com:ValentineC/hackerspace.sg

* 'master' of github.com:ValentineC/hackerspace.sg:
  added 10px bottom padding to PayPal link
  changed PayPal link from centre to 45px left padding; removed library link
  added library link, minor content edits, removed "current plans"
  added em-dashes and dollar symbols to membership rates for better readability
  centred PayPal link