Fix CLI tutorials for Colab

[ElliottKasoar]

Resolves #485

This adds a few changes needed to run successfully in Colab:

• Downgrading NumPy, which is installed by default
  • This also requires restarting the session, which is done automatically as part of these changes
• Downgrade torch
  • MACE should work with torch 2.6, but our current version of SevenNet does not, which I think it mostly because MACE forces an old version of e3nn (MACE introduced a workaround, whereas SevenNet has recently upgraded e3nn - see Update SevenNet #490)
  • We also need to remove torchaudio (and also torchvision, to be safe), as this is pre-installed, but raises an error
• Ensures the ./data exists for geomopt.ipynb
• Disables all carbon tracking, since this seems to throw errors in Colab (may be worth revisiting, at least once sudo is hopefully removed for MacOS)
• Fixes data links

Also tides up a few cells in minor ways

[oerc0122]

Looks good!