we're all stoked for stokes

Replaced the term "vanishing" with evanescent since vanishing is already used for something else. Also did other stuff.

At last! The biggest update to the math notes in a long time. I have wanted to make a set of notes where I reconcile the Leibnizian view of calculus with the modern epsilon-delta view for years now, and I feel like now I'm finally getting there.

finally came up with a layout for the website that im happy with. maybe now i'll finally work on the actual content. though its far more likely that i'll just slumber for another 4 months instead.