Advertise Raspberry Pi4 as the preferred/recommended hardware

[chombourger]

We had started with the NanoPI NEO LTS as the recommended hardware because it was cheap. As we are adding features and putting larger test images on the shared storage, the NanoPI is starting to struggle. As we have upgraded our labs to use the Raspberry Pi4, we should update our documentation (including our toplevel README) to recommend that SBC.

[fmoessbauer]

Agree, but we should also keep in mind that some labs are already using a fleet of NanoPI NEO boards. Do we know which features contributed to making mtda more "heavy"? Probably many of our deployments don't need them (like the pyodide infrastructure). These could then just disable this via the kas file, similar to how we currently handle the lava support.

[chombourger]

Agree, but we should also keep in mind that some labs are already using a fleet of NanoPI NEO boards. Do we know which features contributed to making mtda more "heavy"? Probably many of our deployments don't need them (like the pyodide infrastructure). These could then just disable this via the kas file, similar to how we currently handle the lava support.

pyodide puts the load on the browser, not really on the Pi. Performance issues may be seen when we do storage write with some memory hungry compression formats. We may need to investigate our memory usage - it may occasionally get high