docs: remove old doxygen builds

[mrpollo]

hopefully i got them all and the right way

[hamishwillee]

Just FMI, why? Is the generated documentation not useful?

[mrpollo]

As far as I'm aware, we are not using any of this, are we? please confirm @hamishwillee @dagar

[hamishwillee]

As far as I'm aware, we are not using any of this, are we? please confirm @hamishwillee

I can tell you it isn't linked anywhere from PX4 docs.

Doxygen is an excellent tool if you want to publish and maintain docs for a public API/interface. So if PX4 were to more obviously manage its interfaces this would be a good thing to keep. If we're not using it for that purpose, it isn't needed - and we don't.
Probably someone will try add it back at some point because it usually considered a good thing to do.

[DronecodeBot]

This pull request has been mentioned on Discussion Forum for PX4, Pixhawk, QGroundControl, MAVSDK, MAVLink. There might be relevant details there:

https://discuss.px4.io/t/px4-team-sync-and-community-q-a-may-6-2025/45433/2