[codex] add Nushell to project suggestions

[Sean-Kenneth-Doherty]

Summary

• add Nushell to the project suggestions list
• link the card to the Nushell GitHub contributor page
• include GitHub avatar, concise description, and shell/CLI tags

Validation

• GitHub API reports nushell/nushell is public, unarchived, and on main
• https://github.com/nushell/nushell/contribute returns HTTP 200
• https://avatars.githubusercontent.com/u/50749515?v=4 returns HTTP 200
• nushell/nushell has open good first issue-labeled issues
• Nushell source count is 1 via src/data/projects.js import
• git diff --check
• GITHUB_TOKEN=$(gh auth token) pnpm build
• generated dist/index.html contained the Nushell card and contributor link before restoring generated files

Addresses #1

[Sean-Kenneth-Doherty]

Validated locally on head 2615fd7ac63167e339ff02583372d5fb89f556a3 in an isolated worktree:

• gh api repos/nushell/nushell --jq ... confirmed the repo is public, unarchived, and on main
• gh issue list --repo nushell/nushell --label "good first issue" --state open --limit 3 --json number,title --jq "length" returned 3
• imported src/data/projects.js and confirmed the Nushell source count is 1 with the expected contributor link and avatar
• curl -L returned HTTP 200 for https://github.com/nushell/nushell/contribute
• curl -L returned HTTP 200 for https://avatars.githubusercontent.com/u/50749515?v=4
• git diff --check origin/main...HEAD && git diff --check
• GITHUB_TOKEN=$(gh auth token) pnpm build
• checked generated dist/index.html before restoring generated files; the Nushell card is present and the contributor link appears once

All passed. gh pr checks reports no hosted checks on this branch.

[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.