[lecture] Updates

[mmcky]

This PR

With magnificent and decisive help from Humphrey, we have subdivided, extended, and rewritten the lecture on the Friedman-Wald problem. We did this in a branch tom_info_stat. I have just pushed it.

thanks @thomassargent30 and @HumphreyYang

[mmcky]

@HumphreyYang left some suggestions to see if they fix the pdf compilation issue.

[HumphreyYang]

Many thanks @mmcky, I just came back from hospital. I will have a look into it and go through the lecture again!

[github-actions]

🚀 Deployed on https://6864e08af6cc99bebddac737--nostalgic-wright-5fa355.netlify.app

[mmcky]

Many thanks @mmcky, I just came back from hospital. I will have a look into it and go through the lecture again!

Thanks @HumphreyYang -- hope all is OK! No rush. I'll also look at doing a few pdflatex runs locally.

[mmcky]

thanks @HumphreyYang for the fixes. Looks like the PDF is building now.

@jstac this is ready for review if you have time.

I will merge this later today (this evening) for Tom.

[jstac]

In this lecture, we

This won't come out well in, say, printed form. I recomment replacing such statements with In [an earlier lecture]() or In [our lecture on xxx]()

As we learned in probability with matrices and two meanings of probability,

Capitalize lecture titles?

[mmcky]

thanks @HumphreyYang @jstac and @thomassargent30.

LGTM.