beautify the HTML/CSS

[Die4Ever]

in https://github.com/video-game-randomizers/rando-list/blob/main/src/index.html

and https://github.com/video-game-randomizers/rando-list/blob/main/src/_includes/series.html

see: https://jekyllrb.com/docs/

you can install Jekyll locally, or just let GitHub Actions generate the page data and then download the files from there

we should probably use a template: https://jekyllrb.com/docs/step-by-step/04-layouts/#creating-a-layout

and for CSS: https://jekyllrb.com/docs/step-by-step/07-assets/ or https://jekyllrb.com/docs/static-files/

we could also look at using a theme: https://jekyllrb.com/docs/themes/