Meta: docs updates

[mcous]

Overview

We've got a few tickets open that require docs updates over in testing-library/testing-library-docs. This is a meta-ticket to help me track them all

Docs updates

• #48
  • Add an example using a wrapper component
• #117
  • Add an example using a wrapper component
• #178
  • Add an example using vi.fn() spies
• #211
  • Investigate and fix example
• #222
  • Add resolve.conditions to Vitest setup docs
• #252
  • Update Jest setup docs to use ESM
• #294
  • Update Vitest docs to use @testing-library/svelte/vitest for cleanup

[mcous]

Opened testing-library/testing-library-docs#1360 to address a batch of these

[mcous]

@yanick I've opened testing-library/testing-library-docs#1366 to close out the remaining docs tickets