[codex] add Grafana to project suggestions

[Sean-Kenneth-Doherty]

Summary

• adds Grafana to the project suggestions list
• enables beginner-friendly issue previews for the Grafana card

Addresses #1.

Validation

• verified grafana/grafana is public and not archived
• verified current rendered issue previews #115711, #102190, and #74382 are open with good first issue and help wanted labels
• verified the Grafana avatar URL returns 200 image/jpeg
• git diff --check
• GITHUB_TOKEN=$(gh auth token) pnpm build
• inspected dist/index.html: Grafana card renders, 153 project cards total, and Grafana issue previews render

[Sean-Kenneth-Doherty]

Fresh validation against the current PR head (dac54f6):

• grafana/grafana is public, unarchived, and currently uses main as its default branch
• the configured Grafana avatar URL returns 200 image/jpeg
• imported projectList and confirmed the Grafana card uses https://github.com/grafana/grafana with loadIssues: true
• GITHUB_TOKEN=$(gh auth token) pnpm build -> Astro build succeeded, 2 pages
• confirmed generated dist/index.html contains the Grafana card and Grafana issue preview links
• generated preview issues 115711, 102190, and 74382 are currently open and include good first issue/help wanted labels
• git diff --check origin/main...HEAD -> clean

Generated .astro/dist output was restored after validation.

[Sean-Kenneth-Doherty]

Closing this to reduce maintainer review noise from my project-suggestion-only PR batch. I am pruning these so the queue can focus on concrete bug, security, accessibility, and performance fixes.