READY! [Docs] Remove image embed using rst notation

[stichbury]

Description

Consistency PR to remove {image} and replace with markdown inline embed.

Development notes

Grepped, replaced, rebuilt, inspected. Docs build is here https://kedro--3496.org.readthedocs.build/en/3496/index.html

Developer Certificate of Origin

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Checklist

• Read the contributing guidelines
• Signed off each commit with a Developer Certificate of Origin (DCO)
• Opened this PR as a 'Draft Pull Request' if it is work-in-progress
• Updated the documentation to reflect the code changes
• Added a description of this change in the RELEASE.md file
• Added tests to cover my changes
• Checked if this change will affect Kedro-Viz, and if so, communicated that with the Viz team

[stichbury]

We need to check over these docs once the dependabot changes are made to the docs tools dependencies, just to confirm all is building OK with newer versions of sphinx, mystparser and sphinx-copy.

Edit (11/01): All looks fine to me

[AhdraMeraliQB]

TIL how to define alt text in markdown!

[astrojuanlu]

LGTM!