Replace remote GitHub avatars with local assets

[joshfarrant]

Summary

• Removed remote usage of https://github.com/mona.png and replaced with local asset instead.
• Modified types in IDE component to remove unused avatar property from assistant message type
  • This allowed me to remove the unused assistant avatars from fixture data. They were set to https://github.com/copilot.png, which doesn't resolve anyway.

What should reviewers focus on?

• Check I've not missed any instances of remote GitHub avatars
• Check that nothing has changed visually in the docs or Storybook

Steps to test:

Supporting resources (related issues, external links, etc):

Contributor checklist:

• All new and existing CI checks pass
• Tests prove that the feature works and covers both happy and unhappy paths
• Any drop in coverage, breaking changes or regressions have been documented above
• UI Changes contain new visual snapshots (generated by adding update snapshots label to the PR)
• All developer debugging and non-functional logging has been removed
• Related issues have been referenced in the PR description

Reviewer checklist:

• Check that pull request and proposed changes adhere to our contribution guidelines and code of conduct
• Check that tests prove the feature works and covers both happy and unhappy paths
• Check that there aren't other open Pull Requests for the same update/change

[changeset-bot]

🦋 Changeset detected

Latest commit: b0450d3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

Name	Type
@primer/react-brand	Patch
@primer/brand-primitives	Patch
@primer/brand-e2e	Patch
@primer/brand-fonts	Patch
@primer/brand-config	Patch
@primer/brand-storybook	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

🟢 No design token changes found

Copilot reviewed 7 out of 10 changed files in this pull request and generated no suggestions.

Files not reviewed (3)

• apps/docs/content/components/Avatar/react.mdx: Language not supported
• apps/docs/content/components/IDE.mdx: Language not supported
• apps/docs/content/components/Testimonial/react.mdx: Language not supported

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[github-actions]

🟢 No visual differences found

Our visual comparison tests did not find any differences in the UI.

[danielguillan]

Thanks for fixing this!

[rezrah]

Nit... this seems a little duplicative. Took me a second to spot the difference . Worth creating an intersection with a shared message type for handle, message, codeSnippet and highlighter?

[joshfarrant]

Works for me, updated 🙂

[rezrah]

We'll need a changeset for this update as it's a material change to the library. Although, it doesn't need to say too much.

Maybe something like: Updated IDEChatMessage type declaration to differentiate between assistant and user messages. WDYT?

[joshfarrant]

Good shout, added 👍

[rezrah]

Thanks @joshfarrant. Left a comment about a missing changeset, but otherwise LGTM. Will pre-emptively ✅ so you can merge in when ready.

[joshfarrant]

Thanks @rezrah 🙌

Just made those changes, will merge once the checks have finished