Ask HN: Can I make a front end to an existing website?

I am a grad student that works a lot in nanofabrication. My school has a website that controls all the scheduling for the tools that I use (SEM, etchers, evaporators, etc.), but the user interface is horrible, especially for mobile. I want to create a new mobile website, which takes the information from the existing website after I've logged-in and re-displays it in better format. I'd rather not require a server and have to parse the html that I'm receiving from the existing website in Python. Can I do this in simple HTML and Javascript?