New links in sidebar

Haha! I've finally been able to add links down the sidebar. In addition to the UK and worldwide AI websites, and a link to the original pledge, there are now links to several (mostly AI) webpages, organised as 'Act Now', 'Campaign', 'Contact Details', 'Donate', and 'Get Involved'. The 'Act Now: Current Worldwide Appeals' will take you to this month's letters that need writing.