I wish many manufactures would begin adding Pin mux inside MCU, like espressif. So most of the time you don't care which pin has which function, and make designing pcb for it much less painful.
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Recently I've updated these with a new "Upside-down" view to complement the rear view, giving a pinout in the right orientation to match your project.
The Pico sites are all hand-coded single HTML pages with supporting CSS and minimal JS. They are set up to optionally install as a "Desktop" web app. They also degrade into a somewhat usable table in lieu of CSS and use vector graphics (for the board itself) to be viewable and printable at any size.
Finally, hidden behind "Advanced" is a pinout of the test pads and special function pins!
[1] - https://web.archive.org/web/20130505194305/pi.gadgetoid.com/... [2] - https://pico.pinout.xyz [3] - https://pico2.pinout.xyz