[docs] Logo loading error in Readme

[prane-eth]

Description
In README.md file, 2 images failed to load in both light mode and dark mode, and return error 404 when I tried to open the URL.

Current documentation
README.md: https://github.com/guardrails-ai/guardrails/blob/main/README.md

Suggested changes
N/A

Additional context
Image 1:

Image 2:

Checklist

• I have checked that this issue hasn't already been reported
• I have checked the latest version of the documentation to ensure this issue still exists
• For simple typos or fixes, I have considered submitting a pull request instead

[CalebCourier]

fixed