Feature/sp500 data

here are a few steps towards recreating figure 2
Yes, I agree. I was trying to be self-contained.  And as you use some stuff I am not familiar with (devtools ...) I just thought I'd give you something self-contained and let you finish from there.  So maybe just accept as is and tweak locally to your liking rather than us going back and forth only for you to still have to tweak it?