Automate the readme markdown table

[moul]

The README is outdated. By incorporating metadata in our presentations via frontmatter in the README.md or a metadata.yml file, we can keep it accurate and consistent.

[moul]

Check out this handy tool I created: mdtable.

Next steps:

1. Implement metadata files.
2. Create a script to merge metadata into a CSV file.
3. Utilize mdtable.
4. Embed the generated markdown into the readme, using embedmd.

[leohhhn]

Done in #60

[moul]

Awesome, it looks nice!

Improvement suggestions:

• Don't limit to 15; show everything.
• Limit the columns size and add automatic ellipsis.
• Add a new duration column that can display "<30m" instead of the accurate duration.
• Add a new tags column to keep the list short and useful, such as "purpose" tags.