"Contents" does not work

[sayaikegawa]

Hi @mmcky ,
The code below in md does not work in all lectures.

```{contents} Contents
:depth: 2

( In rst,

.. contents:: :depth: 2

)

For example, in this lecture,
The netlify version shows like below.

Whereas, the website shows like below.

[mmcky]

thanks @sayaikegawa for reporting these issues. I will work through them this week to resolve.

[mmcky]

@sayaikegawa I think these are missing across all lectures. The new theme supports contents on the rhs.