Complete Update/Overhaul of Hugo Backend

[kelseasouders]

This is a test PR to ensure that the build-deploy process still behaves with the new hugo updates. The files appear to have changed, so I am unsure if it will be "plug and play".

This PR contains much-needed updates to the hugo backend that we use for the TESLa website. The previous version was extremely outdated and featured a convoluted file structure that made things more difficult than necessary. According to the hugo blox documentation, the best course of action when updating an "ancient" installation is to scrap everything and bring the content/ directory over, so I have done just that.

I have also cleaned up the file structure and pruned a significant amount of the extra "bloat" files that we were keeping, for some reason. In the event that we want to add extra blocks in the future, you can find the guide to do so here.

As it stands, the content of the site should be as close to a 1:1 remake of the original form, save for certain functional aspects that weren't kept in the new version of the theme-research-group repo (for instance, the tabs in the navigation bar no longer highlight).

I have made a few organizational changes that should make the site easier to maintain. The entire homepage is controlled by /content/_index.md, instead of dozens of separate files. Furthermore, I have organized the /content/authors/ directories so that a user's information is contained in a single directory, as described in the README.

This is an initial commit of sorts, so I will need to verify that the build process still works, but everything renders correctly on my laptop running hugo v0.124.1.

[kelseasouders]

Apparently the GitHub checks might not allow deployment through PR's... might have to merge to see that it deploys. It builds fine, though.