Replace fork and clone diagram with accessible Mermaid diagram

[ShrutiShahi18]

What does this change?

Common Content?

• Block/s

Common Theme?

• Yes

Issue number: #issue-number

Org Content?

Module | Sprint | Page Type | Block Type

Checklist

• I have read the contributing guidelines
• I have checked my spelling and grammar with an automated tool
• I have previewed my changes to check the markdown renders as I intend
• I have run my code to check it works
• My changes follow our Style Guide

Who needs to know about this?

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[illicitonion]

Thanks for putting this together!

I approved your deploy preview, and it looks like this is currently broken: https://deploy-preview-1443--cyf-programming.netlify.app/onboarding/sprints/1/prep/#working-locally

Please can you fix up the syntax errors so that it renders?

Also, it'd be great to make the mermaid diagram look more like the image - so having the remove vs local boxes around the nodes, and the fork/clone labels on the edges between them.

You can preview this locally for debugging by:

1. In a .env file in the repo root, setting HUGO_CURRICULUM_GITHUB_BEARER_TOKEN to point at a GitHub token of yours
2. in the org-cyf-itp directory running npm i && npm run start:dev

[illicitonion]

Actually, it looks like someone else filed #1444 which already meets those criteria, so we can merge that, but thank so much for taking the time to work on this!