Deploy docs

[MabezDev]

The input for this workflow is honestly pretty gruesome, I think I can improve it later though.

Basically it's some json input like [{"name":"esp-hal","tag":"v0.23.1"},{"name":"esp-wifi","tag":"esp-wifi-v0.12"}] along with the server to deploy to.

I got the docs to deploy to my GHA: https://mabezdev.github.io/esp-hal/esp-hal/0.23.1/esp32c6/esp_hal/index.html with the version selector etc working nicely. So the next step is to switch out the GHA step with the SCP step instead.

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It works, docs now deploying to preview here: https://preview-docs.espressif.com/projects/rust/

• First run that built esp-hal and esp-wifi: https://github.com/esp-rs/esp-hal/actions/runs/13399549430.
• Follow up run that added esp-backtrace but left the others in tact: https://github.com/esp-rs/esp-hal/actions/runs/13400731461

[MabezDev]

Note to me: resolve before merging