feat: Add repo README on installation & display in project details tab

[raysubham]

What does this PR do?

1. On installation, it fetches the repo default branch and readme content and updates them in the DB.
2. It renders the readme in the project details tab

Fixes https://github.com/formbricks/oss.gg/issues/56

https://github.com/formbricks/oss.gg/assets/66999381/6ededc4f-6066-44cf-80f2-a76fb9bd7c00

How should this be tested?

• Test A
• Test B

Checklist

Required

• [ ] Filled out the "How to test" section in this PR
• [x] Read How we Code at oss.gg
• [x] Self-reviewed my own code
• [x] Commented on my code in hard-to-understand bits
• [x] Ran pnpm build
• [x] Checked for warnings, there are none
• [x] Removed all console.logs
• [x] Merged the latest changes from main onto my branch with git pull origin main
• [x] My changes don't cause any responsiveness issues

Appreciated

• [x] If a UI change was made: Added a screen recording or screenshots to this PR
• [ ] Updated the Formbricks Docs if changes were necessary

[vercel[bot]]

@raysubham is attempting to deploy a commit to the formbricks Team on Vercel.

A member of the Team first needs to authorize it.

[github-actions[bot]]

Thank you for following the naming conventions for pull request titles! 🙏

[jobenjada]

works well mate, good job!!

[jobenjada]

/award 400

[oss-gg[bot]]

Awarding raysubham: 400 points!