Single main branch

[ptheywood]

Currently there are 2 active branches for this repo: main and google-colab, where the google-colab version has minor changes to ensure it runs with verisons compatible with google colab.

When making new FLAMEGPU releases, this is a faff as 2 notebooks have to be modified (and diffing/merging notebooks is grim).

Instead, we could combine these notebooks, and conditionally detect the use of google colab, as @mondus did in FLAMEGPU2_python_sugarscape_tutorial:

import sys
IN_COLAB = 'google.colab' in sys.modules
if IN_COLAB:
    ... 

This would simplify reduce faff, but slightly increase the complexity of a single cell in the notebook.

• Combine google-colab changes into main with guards where needed
• Update flamegpu.com/try google colab link
• Delete google-colab branch

Suggested by @mondus