Formatting for revised lessons

[oharac]

Title: lesson should have a YAML header with just the title.

• This enables the quarto-title-block with the gradient and logos.
• This title also shows up in the left sidebar navigation, even if the doc is referenced as just a qmd (i.e., no text: ... href: ... needed)
• Note that a single header 1 at the start of the doc will also populate the sidebar, but won't produce the gradient title block.

---
title: Lesson Title Here
---

Headers within document:

• Level 2 headers as top-level in document, and other levels below that
• In the lesson TOC, to the right, doesn't seem to increment chapter-by-chapter - just lesson by lesson. The book version incremented from lesson to lesson which is nice, but not super important. Maybe there's a way to control that in the _quarto.yml?

Lesson order:

• After title, a level 2 unnumbered header for learning objectives, followed by slides (if using), and then a level 2 header beginning the content.

---
title: Working in R & RStudio
---

## Learning Objectives {.unnumbered}

-   objective 1
-   objective 2 etc

[Full Screen](slides/r_programming_introduction/example_slides.html)

```{=html}
<iframe class="slide-deck" src="slides/r_programming_introduction/example_slides.html" height="420" width="747" style="border: 1px solid #2e3846;"></iframe>
```

## Lesson content

Here's where the lesson begins

[oharac]

I like a lot of the ideas on this page -

• learning objectives in a callout-tip block
• suggestions for use of various callouts
• other general good tips for a course website/book