A few html5-ish updates to the doc head
A few html5-ish updates to the doc head

Similar to: https://github.com/h5bp/html5-boilerplate/blob/master/dist/index.html
Inc. removing a couple closing slashes
adhoc-gti/flatpickr,chmln/flatpickr,sylvaingi/flatpickr,chmln/flatpickr,adhoc-gti/flatpickr,SchipholRedesign/flatpickr,SchipholRedesign/flatpickr