I sympathize with the author. I have built my maths site just 2 years after this one, when I was in high school. Ever since I've only been adding material, and occasionally moving old stuff into subdirectories; other than that, it's the same old geocities website made with FPE, except it's now hosted on a university server and has my academic title and office and no more colored background. Oh, and I now edit it with notepad++ and track it with git.
I've had plans to rebuild it for the last 8 years or so, to make it better and slicker and easier to navigate (as it stands, my new papers are mixed together with my scribe notes from undergrad). But I never figured out how to achieve this without also requiring javascript or relying on tools that may not survive the next decade and that I cannot tweak to my needs without learning a new programming language (hello Jekyll, hi Hugo). Nor did I ever find the Right Way how it should be structured; move one thing to the front and something else gets harder to find. I guess it will survive me.
Makes me a lot less judgmental when I see another academic website that can trace its lineage back to geocities and angelfire.