[Algorithms] Flesh out Making Crepes example

[meganesu]

Summary

Fleshes out the time-efficient algorithm and space-efficient algorithm examples about making crepes in the Algorithms course

Fixes issue #481

Here's a description of changes:

• Adds slides with pseudocode for both crepes algorithms.
• Fixes typos in the images for the crepes code.

Before you merge, make sure you visually check your changes in the deploy preview. A link to the preview will appear in the PR comments when ready.

cc @gdisf/admins

[verythorough]

Deploy preview for teaching-materials ready!

Built with commit edad0d1

https://deploy-preview-619--teaching-materials.netlify.com

[meganesu]

(Only look at the last two commits. The first three are from an old PR I made, I'm not sure why they're showing up in here 😅)

[stale]

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[stale]

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