Render images in certain Blitz, Basics, and Youtube tutorial notebooks

[kiersten-stokes]

This PR adds a root image path to the sphinx_gallery_conf dict according to these instructions given in the Sphinx Gallery docs. It also updates the corresponding relative paths in the image directives in certain Blitz, Basics, and Youtube tutorials.

Related to #791. I'm not going to link a 'closing' keyword yet, as this PR 1. addresses just a subset of the tutorials, and 2. may not be a viable solution (pending testing on the deploy preview).

Since this is affecting a project conf that I may not have historical knowledge as to why this wasn't used previously, I fully understand if we're not able to incorporate this one!

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[kiersten-stokes]

I have a question for someone more knowledgeable than me (@svekars 🙂). After building with make html, the notebook file created in the _build/html/_downloads directory looks like the below screenshot, with the image rendered as expected.

Is this the version notebook that would be available via the Run in Colab link once (hypothetically) the PR is merged?

[svekars]

Thanks, Kiersten. I'm not sure why we'd want this and what's the actual value. Can you please elaborate?

[kiersten-stokes]

Can you please elaborate?

@svekars I should have included some screenshots in my description! Basically, while the built-in images are displayed in the HTML with no issue, they are not currently displayed in the notebook files.

Example of what is displayed in the Colab notebook now:

vs the HTML display:

These changes make it so that the the image is viewable in both the HTML and the notebook files (well, depending on the answer to the question I posed in this comment).

shown here in notebook form (though not in Colab obviously)

Definitely not a 'need-to-have' by any means but figured I would propose it since there was a corresponding issue!

[svekars]

Oh, I see. This definetely looks useful, although I'm not 100% sure if this would work. Let me check around and get back to you.

[kiersten-stokes]

Oh, I see. This definetely looks useful, although I'm not 100% sure if this would work. Let me check around and get back to you.

@svekars any update? No hurry, just suddenly remembered that I had this one open 😄

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