fix README.md broken link

[tylim88]

Please describe the changes this PR makes and why it should be merged:

Status

• Code changes have been tested against prettier, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating

Semantic versioning classification:

• This PR changes the codebase
  • This PR includes breaking changes (methods removed or renamed, parameters moved or removed)
  • This PR changes the internal workings with no modifications to the external API (bug fixes, performance improvements)
• This PR only includes non-code changes, like changes to documentation, README, etc.

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Name	Status	Preview	Comments	Updated (UTC)
million-kitchen-sink	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 25, 2024 1:15am
sink	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 25, 2024 1:15am

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[github-actions]

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[greptile-apps]

PR Summary

This PR updates the installation guide link in the README.md file for improved user experience.

• Updated link from 'https://million.dev/docs/install' to 'https://million.dev/docs' in README.md
• Ensures users can access the correct documentation page for installation guidance
• Minor change with significant impact on user accessibility to important information

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