Replace fork and clone diagram with accessible Mermaid diagram

[ShrutiShahi18]

What does this change?

Common Content?

• [x] Block/s

Common Theme?

• [x] Yes

Issue number: #issue-number

Org Content?

Module | Sprint | Page Type | Block Type

Checklist

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

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[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!