404 page

[bridgetf7]

• add rerouting in router to 404 if page does not exist (router/index.js)
• add button on 404 page that reroutes to home
• add a lil blurb along the lines of "uh oh, this page doesn't exist"
• seagull image

[bridgetf7]

@kevinc2465 this is the 404 seagull, please also credit Yifan by writing "Drawing by Yifan Zhang '25" in low opacity font below the image

[bridgetf7]

this was my vision for the page lol