Remove basic auth from nginx

[kylemclaren]

Summary

• Removes HTTP basic authentication from the docs site (reverts Add basic auth to nginx #62)
• Deletes .htpasswd file
• Removes auth_basic directives from nginx.conf
• Removes .htpasswd copy from Dockerfile

Test plan

• Deploy and verify docs site is publicly accessible without auth prompt

🤖 Generated with Claude Code

[github-actions]

CLI Documentation Generator

Metric	Value
CLI Version	0.0.1
Commands Generated	24
Tests	✅ 0/0 passed

📚 Commands documented

• sprite login
• sprite logout
• sprite org auth
• sprite org list
• sprite org logout
• sprite org keyring disable
• sprite org keyring enable
• sprite auth setup
• sprite create
• sprite use
• sprite list
• sprite destroy
• sprite exec
• sprite console
• sprite checkpoint create
• sprite checkpoint list
• sprite checkpoint info
• sprite checkpoint delete
• sprite restore
• sprite proxy
• sprite url
• sprite url update
• sprite api
• sprite upgrade

[github-actions]

Preview Deployment

Name	URL
Preview	https://pr-77-superfly-sprites-docs.fly.dev

Commit: add3c18

[github-actions]

Lighthouse Results

URL	Performance	Accessibility	Best Practices	SEO
/	🟢 90	🟢 100	🟢 96	🟢 100

[kylemclaren]

@kcmartin merge this to remove password from the site

[github-actions]

E2E Test Results

✅ Tests success

Ran against: https://pr-77-superfly-sprites-docs.fly.dev