UI and usability

[shensquared]

• download as pdf
• staff horizontal layout
  - [ ] side bar sizing
• logo
• Hamburger positioning on small screen #4
• title line height #5
  - [ ] (maybe?) side bar collapsing?
• make 404 fun and funky @( * O * )@

[shensquared]

sidebar will be addressed once migrated to Docusaurus
actually I've had really good experience with quarto
https://visionbook.mit.edu
https://introml.mit.edu/notes/
probably will migrate to quarto at some point.