Remove logo from docs website hero section

[Copilot]

Removes the Houston Astro mascot logo from the documentation website homepage to provide a cleaner, logo-free hero section.

Changes Made

The Houston logo was displayed in the hero section of the docs homepage via the Starlight configuration in docs/src/content/docs/index.mdx. This change removes the image configuration while preserving all other hero elements:

hero:
  tagline: Exploring AI-powered repository automation, run safely on GitHub Actions, from GitHub Next
-  image:
-    file: ../../assets/houston.webp
  actions:
    - text: Quick Start Guide
      link: ./start-here/quick-start/
      icon: right-arrow
    - text: View on GitHub
      link: https://github.com/githubnext/gh-aw
      icon: external
      variant: minimal

Result

The homepage now displays a clean layout with the title, tagline, and action buttons without any logo image. All documentation functionality remains intact, and the site builds successfully.

Testing

• ✅ Documentation builds successfully without errors
• ✅ All existing tests continue to pass
• ✅ Code formatting and linting checks pass
• ✅ Hero section displays properly with all elements except the logo

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• api.contoso.com
  • Triggering command: /tmp/go-build3332577389/b279/cli.test -test.testlogfile=/tmp/go-build3332577389/b279/testlog.txt -test.paniconexit0 -test.timeout=10m0s -test.v=true (dns block)
• telemetry.astro.build
  • Triggering command: node /home/REDACTED/work/gh-aw/gh-aw/docs/node_modules/.bin/astro build (dns block)
  • Triggering command: node /home/REDACTED/work/gh-aw/gh-aw/docs/node_modules/.bin/astro dev (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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