Improve 209
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quality of life changes for the CSC209 winter 2023 website Features -------- * dark mode based on system colour scheme * C syntax highlighting based on highlight.js * popup to quickly access lecture slides Links * current link is now bolded in the navbar * external links now open in a new tab + new tab links have an indicator * main nav better complies with fitts law (bigger click targets) * fixed the broken piazza link * added a link to submit labs and stuff in the main nav Lecture Notes * reordered lecture notes so they're reverse-chronological (newest is at the top)
