feat(lesson): pep8, linters & code formatters

[lwasser]

todo: add to bottom of intro clean code page:

[^zenofpython]: Paste this into your shell:python -c 'import this'``

[willingc]

@lwasser @sneakers-the-rat Let's split this PR up or merge as is and then do another iteration. I'm finding it difficult to work with all three files in the same PR and follow proposed edits.

I would love to see something more along the lines:

• Create maintainable code
  • Why it's helpful
  • What are elements of maintainable code
    • Clean
    • Modular
    • Readable
    • Consistent code style
    • DRY: minimize code repetition
• Code style
  • What is code style
  • Why it's important
    • Easier to maintain
    • Easier to change and review
  • Types of tools (generic)
    • Linters
    • Formatters
    • Integrated into editors, IDEs, CI
• Python code style: PEP8 and beyond
  • PEP8
  • black

Etc.

[willingc]

@lwasser Let's merge this as is and iterate on separate PRs.

[lwasser]

Ok fantastic yall. Let's do this

1. When I'm back at.my computer I'll turn the bigger comments into issues!
2. I already committed the online edits!
3. I'll merge so we can then iterate on smaller prs. This likely will happen after the fall festival but I'm excited to work on this with everyone!! And I'll keep each pr small from here on in..

I hope that works for you both!! ✨️