docs: two broken file links (CONTRIBUTING license link, crewai-tools logo)

AI-generated contribution: authored with AI assistance (per the Contributing guide). Please apply the llm-generated label — I don't have permission to add labels.

Description

Two file links 404 on GitHub:

• .github/CONTRIBUTING.md line 176 links (LICENSE), which resolves to .github/LICENSE — that file doesn't exist; the MIT License lives at the repo root.
• lib/crewai-tools/README.md line 3 embeds ./assets/crewai_logo.png, but lib/crewai-tools/assets/ doesn't exist. The logo lives at docs/images/crewai_logo.png.

Steps to Reproduce

1. Open the rendered CONTRIBUTING.md and click the "MIT License" link → 404.
2. Open the rendered crewai-tools README → the logo renders as a broken image.

Expected behavior

Both links resolve to the actual files (../LICENSE and ../../docs/images/crewai_logo.png respectively).

Screenshots/Code snippets

# .github/CONTRIBUTING.md, line 176
By contributing, you agree that your contributions will be licensed under the [MIT License](LICENSE).

# lib/crewai-tools/README.md, line 3
![Logo of crewAI, two people rowing on a boat](./assets/crewai_logo.png)

Operating System

N/A (documentation only)

Python Version

N/A (documentation only)

Start with .github/CONTRIBUTING.md line 176 and lib/crewai-tools/README.md line 3. Check the repository-root LICENSE and docs/images/crewai_logo.png paths, then update both Markdown links to the relative paths described in the issue. Done means the rendered license link resolves and the README logo displays without a broken-image marker.