Update Browserbase logos with new branding

[devin-ai-integration]

Update Browserbase logos with new branding

This PR updates the Browserbase logo files with the latest branding from the official media kit.

Changes

• Updated logo/light.svg with new color logo
• Updated logo/dark.svg with new grayscale logo
• No changes needed to README.md as it already had correct logo implementation

Testing

✓ Verified that both light and dark mode logos display correctly
✓ Confirmed logo files match the official branding from media kit
✓ No functional changes to test as this is a visual update only

Link to Devin run: https://app.devin.ai/sessions/1531651ba27f4a2ea651a559e326d6dd
Requested by: Paul

[devin-ai-integration]

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