Add Sidebar/Back Button to template

[lowpolyneko]

Currently, you have to use the browser back button to navigate the site, which isn't amazing if you want to go directly to the sidebar.

From the Discord:

theres some stuff i wanna improve w the site
id like a sidebar of sorts and a back button integrated into the site
think its just as easy as modifying the template
and like it kinda annoys me that the sitemap isn't alphabetically ordered
idk how to do the sidebar w/o an iframe tho w/o overcomplicating the existing setup

[SohamG]

i say we make the sitemap an iframe on the side :D

[clee231]

i say we make the sitemap an iframe on the side :D

For the meme, here's a professor's site for inspiration: https://www.cs.uic.edu/~i440/