Web Mode: Add documentation/tutorial to website

[carlosperate]

Also include a note about the rate limiting being IP based: https://github.com/mu-editor/mu/pull/2264#issuecomment-1164781615

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Edit: Original title was: Web Mode: Add documentation about Python Anywhere deployment

But it looks like we don't have any Web Mode docs right now, so the ticket scope has increased as described in https://github.com/mu-editor/mu/issues/2271#issuecomment-1165511815.

[carlosperate]

Actually, looks like we don't have any docs for the web mode at all.

The Web tutorial link here 404s as it doesn't have an artcile:

• https://codewith.mu/en/tutorials/1.1/
• https://codewith.mu/en/tutorials/1.1/web
• https://github.com/mu-editor/mu-editor.github.io/tree/master/en/tutorials/1.1

Because for v1.2 will need to duplicate the tutorial files (https://github.com/mu-editor/mu/issues/2272), only the markdown file in the 1.2 folder should mention the Python Anywhere feature.

We might also need to update this page to add the new modes. The v1.1 version of this page to include Web Mode, and v1.2 to include also Snek Mode:

• https://github.com/mu-editor/mu-editor.github.io/blob/master/en/tutorials/1.1/modes.md

[prcutler]

I don't know Flask personally, but I'd be happy to partner or assist someone if they are interested in working on a Web tutorial for Flask.

[carlosperate]

Thanks @prcutler! The web mode has been developmed mainly by @ntoll I believe, who is now on holiday for about a week. I'd be happy to review any content, although I'm not too versed in Flash or this mode, I can try to respond to any questions you might have.

And, once again, thanks for all your contributions @prcutler, they are really appreciated and will help a lot of Mu users!