fixed broken links

[brain2626]

Summary

Fixed links from home and guide home to "extend" guide
replaced "extend" image

Basic example

Include a basic example, screenshots, or links.

Motivation

Why are we doing this? What use cases does it support? What is the expected outcome?

Checks

• Verify that your changes build locally. Passes:
  • npm run test
  • npm run build:preview followed by npm run lint
• Create a Pull Request (follow the GitHub flow) and Conventional Commits Specification)
• Supports all screen sizes (if relevant)
• Supports both light and dark mode (if relevant)

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