chore: Update banner image on welcome page

[mannycarrera4]

Summary

Fixes: #3110
Our old banner was dated, updating our welcome banner for something new and fresh.

Release Category

Documentation

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Checklist

• MDX documentation adheres to Canvas Kit's Documentation Guidelines
• Label ready for review has been added to PR

For the Reviewer

• PR title is short and descriptive
• PR summary describes the change (Fixes/Resolves linked correctly)
• PR Release Notes describes additional information useful to call out in a release message or removed if not applicable
• Breaking Changes provides useful information to upgrade to this code or removed if not applicable

Where Should the Reviewer Start?

Areas for Feedback? (optional)

• Code
• Documentation
• Testing
• Codemods

Testing Manually

Screenshots or GIFs (if applicable)

Thank You Gif (optional)

[cypress]

Workday/canvas-kit    Run #8231

Run Properties:   Passed #8231  •  e1f9a86475 ℹ️: Merge 711dbb17d6d25f4824b851d3b85e2751da11cbdd into e1935d1ae7d2a32a746decd4ab55...

Project	Workday/canvas-kit
Branch Review	mc-banner-update
Run status	Passed #8231
Run duration	02m 54s
Commit	e1f9a86475 ℹ️: Merge 711dbb17d6d25f4824b851d3b85e2751da11cbdd into e1935d1ae7d2a32a746decd4ab55...
Committer	Manuel Carrera
View all properties for this run ↗︎

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Test results
Failures	0
Flaky	1
Pending	21
Skipped	0
Passing	929
View all changes introduced in this branch ↗︎

UI Coverage  21.19%
Untested elements	1530
Tested elements	409

Accessibility  99.17%
Failed rules	6 critical   5 serious   0 moderate   2 minor
Failed elements	162