am b094b0c4: modifications to webinars: add the ability to add an upcoming...

am b094b0c4: modifications to webinars: add the ability to add an upcoming webinar event to Google Calendar; add some introduction text; adjust some markup

* commit 'b094b0c4':
  modifications to webinars: add the ability to add an upcoming webinar event to Google Calendar; add some introduction text; adjust some markup