Add Assistants API course to Video courses section

[Pistus]

Summary

Adding the new Assistants API course from Scrimba to the list of Video Courses in the Related Resources page.

Motivation

Makes the API more approachable as this is a step by step course where you build an assistant and actually write code.

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For new content

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• I have added a new entry in registry.yaml (and, optionally, in authors.yaml) so that my content renders on the cookbook website.
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[BrunoSette]

The https://scrimba.com/learn/openaiassistants link is broken.

[perborgen]

@BrunoSette It works on my end (tried multiple browsers). What do you see when clicking the link?

[simonpfish]

Great stuff!

[BrunoSette]

@BrunoSette It works on my end (tried multiple browsers). What do you see when clicking the link?

It is working now.