added page for dynamically changing sponsors at /indrel_admin

[Hoponga]

title basically describes the change

Can add sponsor name, URL, and a picture, saves to /static/img/sponsors

I keep track of the current sponsors with a metadata file, where each line contains name, URL, and filename for the company. every time someone submits the form, it updates the metadata file to either add new companies or remove some

if someone just deletes the entry for a company on the admin page, it deletes that sponsor from the metadata file, & if a file is not added when submitting on the admin page, then it doesn't change the file that's already in the sponsors folder

it's low-key kinda jank with the metadata file but i didn't wanna change anything with the django database & have to run migrations and stuff, so i just did it this way

Pictures:

Adding a sponsor adds a row to this, and deleting content from an existing row deletes that entry

[ochan1]

Could we use the FileField to upload images of sponsors? Why does it have to be static?