Add /images folder and assets for cta banner

[natalierharris]

Summary

This adds and /images folder to the component folder for the CTA banner in primer brand docs, and the image files to that folder

[changeset-bot]

⚠️ No Changeset found

Latest commit: 80eb3d3

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

🟢 No design token changes found

[github-actions]

🟢 Bundle size report

Check	Main	Branch	Change
UMD — full bundle (JS)	101.47 kB	101.47 kB	🟢 No change
UMD — full bundle (CSS)	66.92 kB	66.92 kB	🟢 No change
ESM — full bundle (JS + CSS)	1.51 MB	1.51 MB	🟢 No change
ESM — tree-shaken simple (Button)	69.81 kB	69.81 kB	🟢 No change
ESM — tree-shaken complex (ActionMenu)	78.59 kB	78.59 kB	🟢 No change

[github-actions]

🟢 No visual differences found

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