Thank you for making my day a little brighter.
What I appreciate the most about this string of comments (from OP) is that digging into "doing it for fun", hosting on your own machine, wanting simplicity for you as the maintainer and builder. This has been a big focus for me over a number of years, and it leads to things being not efficient, or scalable or even usable by others—but they bring me joy and that is more than enough for most things.
The reality is that there are of course ways to make this more efficient AND it simply doesn't need to be.
Good job on making something that people are clearly interested in, it brought me some joy clicking around and learning some things.
If you want it to be more than just this, of course you'll have to make it faster or have it be a different interface—installable offline typa thing so we can expect a bundle download and be fine with waiting. For example I can see this as a native app being kinda nice.
If you don't want it to be more than this, that's okay too.
Regardless, well done
Having too many users is a pretty good problem to have anyway!