remove nogus array flip in 2D adv-diff example + code cleanup #84

	name: readme_rust

	defaults:
	run:
	shell: bash

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]
	schedule:
	- cron: '0 13 * * 4'

	jobs:
	rust:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- uses: dtolnay/rust-toolchain@stable
	with:
	components: rust-src
	- uses: actions/setup-python@v5
	with:
	python-version: 3.9
	- run: pip install -e .
	- run: pip install pytest-codeblocks pytest

	- run: \|
	cat >Cargo.toml <<EOF
	[package]
	name = "PyMPDATA"
	version = "0.1.0"
	edition = "2021"

	[dependencies]
	pyo3 = { version = "0.22.2", features=["auto-initialize"]}
	EOF
	- run: mkdir src
	- run: python -c "import pytest_codeblocks; code=pytest_codeblocks.extract_from_file('docs/markdown/pympdata_landing.md'); f=open('src/main.rs', 'w'); f.writelines(block.code for block in code if block.syntax=='Rust'); f.close()"
	- run: cat -n src/main.rs
	- run: cargo run

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