Add contextual descriptions to specialized guides explaining when they're needed

[naomi-freecodecamp]

Description

I'd like to propose adding brief introductory descriptions to the specialized documentation pages (like "Work on Playwright tests", "Work on mobile app", etc.) that explain when a contributor actually needs to reference that guide.

Problem Statement

Currently, specialized guides jump straight into technical content without explaining the context of when a contributor would need them. New contributors may:

• Feel overwhelmed thinking they need to read everything
• Not realize a guide is relevant to their specific contribution
• Waste time reading documentation that doesn't apply to their work

Proposed Solution

Add a short introductory section at the top of each specialized guide that answers:

• When do I need this? - What types of contributions require this knowledge
• Can I skip this? - Reassurance that not every contributor needs every guide

Example

For "Work on Playwright tests":

You'll need this guide if you're adding or modifying end-to-end tests, or if your contribution changes user-facing behavior that requires test coverage. If you're only fixing a typo or updating documentation, you can skip this guide.

Pages That Would Benefit

• Work on Playwright tests
• Work on mobile app
• Work on documentation
• Work on practice projects
• Any other specialized workflow guides

Benefits

• Reduces contributor overwhelm
• Helps contributors find relevant documentation faster
• Makes the contribution process feel more approachable
• Clarifies the scope of each guide upfront

[majestic-owl448]

all the proposals make sense and would be great additions for contributors