docs(contributing): convert diagrams

[Haroenv]

Description

replace the images with mermaid diagrams so they can be edited

Additional context

fixes #15923

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines, especially the Pull Request Guidelines.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Update the corresponding documentation if needed.
• Ideally, include relevant tests that fail without this PR but pass with it.

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[patak-dev]

Nice! Thanks a lot for taking this one so quickly 🙌🏼

Would you delete the images and the .excalidraw files as part of this PR?

[Haroenv]

removed the other source files @patak-dev :)

[patak-dev]

Thanks a lot @Haroenv! We also have the same graphs in Vitest contributing guide https://github.com/vitest-dev/vitest/blob/main/CONTRIBUTING.md#issue-triaging-workflow. Given that you did the work already, would you like to send a PR there too? You get to be a contributor to Vitest too :)

[Haroenv]

added a PR there too @patak-dev :) vitest-dev/vitest#5222