Add minimum supported OS for each product

[jacobgkau]

Requested by @ahoneybun and @thomas-zimmerman.

[jacobgkau]

With how long we've now been supporting 22.04 as the latest release, this wouldn't really add much value unless we specify more specific things, like kernel/driver versions (or iso spin dates-- although that wouldn't help for older releases that we no longer spin isos for but still sometimes push hardware enablement and/or security updates to).

[jacobgkau]

@thomas-zimmerman brought up that the kernel commit (with a link to the commit) that was initially shipped would also be useful. That would probably fit best as a sub-bullet point to the OS version (i.e. a single software bullet point of the specs), and would have more of a purpose than the OS version.

There would still be questions around how to handle kernel updates post-initial shipment of a model (we don't want to have to maintain a changelog within the docs)-- the scope here would likely be limited to just what was first shipped to a customer (which wouldn't mean much in cases like the Astra, but would generally be meaningful).

[jacobgkau]

Brainstorming how this may look:

• Software
  • Original OS:
    • Pop!_OS 22.04 LTS or 22.10 (upgradable to future versions)
    • Ubuntu 22.04 LTS (upgradable to future versions)
  • Earliest shipped Pop!_OS kernel version: 6.9.3 (978a154)

I hesitate to use the word "supported" for any of this since we don't want to imply indefinite support of old versions of things.