a few changes to order.html:
removed polyfill date inputs in favor of input='date' and input='datetime-local' per instructor's request
began writing sidebar content (testimonials are not done yet)
used HTML entity character in first legend
since we are using date inputs again, ...
orderproc.php will now parse the ISO dates returned by those,
rather than the multiple values from the polyfill inputs
Added styles for sidebars on order.html
Added styles for date inputs