docs(readme): update stale Docker VERSION build example

[ulises-jeremias]

Context

The root README Docker build example pins an outdated VERSION=0.2.5 while the package version is newer (currently 0.2.10 in pyproject.toml).

Steps

1. Read the current version from packages/create-awesome-python-app/pyproject.toml.
2. Update the README Docker example to that version (or a clearly commented "pin any released version" note using the current one as example).
3. Grep docs for other stale 0.2.x Docker examples and fix if found.

Acceptance criteria

• Docker example version matches current package version (or is explicitly documented as an example pin)
• No unrelated README rewrites
• Docs still build/render

Files

• README.md
• packages/create-awesome-python-app/pyproject.toml (reference)

How to verify

Compare README snippet version to pyproject.toml [project].version.