Updates to inventory dynamics lecture

[jstac]

Improved flow, used fori_loop instead of scan, removed kernel density estimator.

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[jstac]

@shlff Would you be willing to finish off this PR?

The remaining steps are to

• change mu and sigma to greek letters in the code
• change the last section (section 5.5.2) into an exercise

To change the last section into an exercise, the wording at the start of the section needs to be modified:

"Write a fori_loop version of the last function. See if you can increase the speed while generating a similar answer."

[shlff]

Thanks @jstac . I'd love to!

I'll work on it now and update it soon.

[shlff]

Thanks @jstac . This PR is ready to review.

(I corrected some typos in my third commit)

[jstac]

Many thanks @shlff , nice work! Merging.