Update Dot & Bracket notation lesson

[wvmitchell]

Lesson to be updated: Dot & Bracket Notation

Summary of changes needed:

• Prework section should be rolled into lesson itself, it doesn't need to be homework
• Ensure that the lesson otherwise meet the criteria laid out below
• Add in an example from a previous project (i.e. the final tests in library.js for JS Fun at the Library)

Lesson creation guidelines (also on FE Hub

• Lesson Preparation Foundations
• 4 Pillars of Remote Instruction
• Instructional Values
• Culturally Responsive Teaching