This patch adds code to insert classes into the flatpickr for lead and
trail time on bookings and includes some scss additions to highlight
said periods in display.
Sponsored-by: Cuyahoga County Public Library <https://cuyahogalibrary.org/> Signed-off-by: Kristi Krueger <KKRUEGER@cuyahogalibrary.org> Signed-off-by: Paul Derscheid <paul.derscheid@lmscloud.de> Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>