This looks awesome, unfortunately my attempts to use it result in showing some kind of placeholder blue image with a yellow and black corner, despite it appearing correctly in the list of available widgets. Hopefully that gets fixed soon.
Hmm... that shouldn't happen! If you want to jump over to the discord, I can help debug - https://discord.gg/GnmdtvKW7M No sweat if not.
Seems to be magically working now. Probably some weirdness with GitHub gist URLs.
I should add that to the docs. I have seen changes in Gists take a few minutes to propagate fully. The widget fetching outside the app is a little more sensitive since iOS budgets widget updates. Glad you got it figured out!