feat: add windmill logo

[arthurbret]

📝 About your SVG:

• Title: Windmill
• Category: Devtool
• Website URL: https://www.windmill.dev/
• Description: Windmill is an open-source developer platform for building internal tools, automations, and workflows using scripts written in languages like Python, TypeScript, Go, or Bash. It provides a UI, scheduling, permissions, and APIs so teams can run jobs, orchestrate tasks, and expose scripts as apps or endpoints.

📷 Screenshots:

✅ Checklist

• I have permission to use this logo.
• The .svg file is optimized for web use.
• The .svg size is less than 20kb.