Remove unsupported GPIO file system access method

[vipulgupta2048]

Additionally removed commented section on GPIO pins

---

Please make sure to read the CONTRIBUTING document before opening the PR for relevant information on contributing to the documentation. Thanks!

[flowzone-app]

Website deployed to CF Pages, 👀 preview link https://06a21e5c.balenacloud-docs.pages.dev

[acostach]

lgtm

[lurch]

For future reference, the Balena folks may find "A history of GPIO usage on Raspberry Pi devices, and current best practices" at https://pip.raspberrypi.com/categories/685-whitepapers-app-notes-compliance-guides a useful resource.

[lurch]

BTW I see that this page also says "We recommend [Pi Pins][pi-pins] for node.js projects" but according to https://www.npmjs.com/package/pi-pins it was last published 11 years ago (!) and it also uses sysfs, so it'll stop working on newer Linux kernels.

[vipulgupta2048]

@lurch What's the current recommendation for Node.js projects from Raspberry Pi

[lurch]

@vipulgupta2048 I've got no idea; I don't think that Node.js is something that any of the Raspberry Pi Engineers have looked at.
A quick look at https://www.google.com/search?q=nodejs+libgpiod finds https://www.npmjs.com/package/node-libgpiod which looks like it might do the job, but I've not tried it myself and obviously it's up to Balena to do any testing.

[ghollingworth]

Yeah something based on libgpiod would be best supported, as long as it’s the correct version (shame that they didn’t get the api right the first time!)