docs: add "Python Zero To Hero" to showcases

[KareimGazer]

I have created a presentation explaining Python for the Arabic community using the Python add-on to run Python inside the slide. this adds a step further above and beyond Jupiter notebooks. I thought that it was a good idea to spread the word in the Arabic community and announce that here.

The slides is for the first episode of my Python series "Python From Zero To Hero", and it uses almost all the features of Slidev.

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commit: af6a440