Add metadata to tutorials for better appearance in the Tutorial tab

[gadenbuie]

I love this collection of tutorials!

There are a few things that you can do to make them a little easier to explore in RStudio. The IDE provides a Tutorial tab to explore tutorials in installed packages. Currently DOSStoolkit tutorials appear like this in that pane:

You can improve their appearance by:

• Sorting the tutorials by prepending an index at the front of the directory name, e.g. 00-hello_world, 01-operating_in_an_error_prone_world, etc.

  Unfortunately, this does change the command to run the tutorial — learnr::run_tutorial("00-hello_world", package = "DoSStoolkit") — but you could also provide a wrapper function in this package to find and add the correct prefix and to call learnr::run_tutorial() behind-the-scenes.

• Swapping the title and subtitle field so that the title of the tutorial appears in bold in the tutorial list.

• Copying the list of module content into the description field.

  This can be markdown formatted, so you can just copy the list straight from the README:

  title: "Hello World!"
  subtitle: "DoSS Toolkit"
  date: "25 May 2021"
  output: 
    learnr::tutorial:
      allow_skip: true
  runtime: shiny_prerendered
  description: |
    -   Why I love R, by Liza Bolton.
    -   Setting up RStudio, by Annie Collins.
    -   Getting to know what is what - console, terminal, etc, by Annie
        Collins.
    -   A fun hello world exercise, by Annie Collins.
    -   Another fun hello world exercise, by Shirley Deng.
    -   R Weekly newsletter, R Ladies, R meetups, by Annie Collins.

After making the above changes, the tutorials will appear in the Tutorial tab like this: