Update menu links to point to new support pages
Update menu links to point to new support pages

# May later want to remove the events one and review the commented out link
# to the tutorial. But the FAQ page has been superseded, as has the teacher
# page.

ucam-cl-dtg/isaac-app,ucam-cl-dtg/isaac-app,ucam-cl-dtg/isaac-app,ucam-cl-dtg/isaac-app