update about_py and python_by_example + image fixes

[Zahra-khanzadeh]

Hi @mmcky
I've updated the about_py.md and python_by_example.md lectures:
-Updated translated text to match the latest English versions
-Adjusted image folders and paths accordingly
-Adjusted the placement of parentheses in code examples included in the explanation (in RTL layout, parentheses were displayed in reverse order, for example ()append instead of append(), It might seem a bit odd, but in Persian, when we read technical text and encounter an English expression, we read it left to right even in the middle of a Persian paragraph :) , so I manually flipped them in the Markdown to ensure correct visual alignment on the website.)

Thanks!

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[mmcky]

Thanks @Zahra-khanzadeh.

-Adjusted the placement of parentheses in code examples included in the explanation (in RTL layout, parentheses were displayed in reverse order, for example ()append instead of append(), It might seem a bit odd, but in Persian, when we read technical text and encounter an English expression, we read it left to right even in the middle of a Persian paragraph :) , so I manually flipped them in the Markdown to ensure correct visual alignment on the website.)

This is an interesting problem. I'll have a think about how we might be able to fix this automatically. I can't think of an easy way just yet. Is () the only case? We could add a special post-processor to adjust them in the translation process.

[Zahra-khanzadeh]

Thanks a lot, @mmcky .I really appreciate your time and effort on checking the parentheses issue.

Is () the only case?

Actually, there are a few other small issues I've noticed as well.

1. In the last hint of the python_by_example.md lecture, the final line $area = \pi * radius^2$ breaks the text incorrectly when translated to Persian ( for example, it shows as $مساحت = \pi * شعاع^2$ ).
   As shown in the attached image, the math formula get split from left to right. (I tried several ways to fix it, but none worked so far.)

2. In the python_by_example.md, lines 348-352 should ideally be displayed left to right, since they contain code examples. Otherwise, the text alignment becomes confusing, as shown in the attached screenshot.

3. Finally, it would be great if the titles for Exercises, Hints, and Solutions could also be translated into Persian in the RTL layout. I've attached a screenshot for reference.

Thanks again, Matt. The RTL layout is improving so much with each update, and I really appreciate all the work you're putting into it.

[mmcky]

great feedback - thanks @Zahra-khanzadeh

[mmcky]

I'll merge this PR just to keep the main branch up to date with the latest.