Title: docs: add missing theme presets to README

[gourikataneja]

Is your feature request related to a problem? Please describe.

Problem

The README theme preset table does not document all available themes currently supported by the project.

The codebase includes additional themes such as:

• ocean
• sunset
• forest
• rose
• nord
• synthwave

However, these themes are missing from the README documentation, making them less discoverable for users and contributors.

Expected Behavior

All supported theme presets should be documented consistently in the README theme table.

I would like to work on this issue under GSSoC'26.

Describe the solution you'd like

Suggested Improvement

Update the README theme section to include all currently available themes along with their preview/configuration details.

Describe alternatives you've considered

No response

[github-actions]

👋 Hey @gourikataneja, welcome to CommitPulse! 🎉

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[gourikataneja]

/claim

[github-actions]

✅ Successfully assigned issue to @gourikataneja

💡 Please read CONTRIBUTING.md if you haven't already. Good luck! 🚀

[ashi23codes]

/claim

[github-actions]

❌ Only the author of this issue (@gourikataneja) can claim it.

[github-actions]

⚠️ Assignment automatically removed due to inactivity.
Feel free to reclaim the issue if you want to continue working on it.

[gourikataneja]

/claim

[github-actions]

🎉 Assigned! Welcome to the project, @gourikataneja.

⏳ Reminder: You have 2 days to submit a Pull Request. After 2 days of inactivity, you will be automatically unassigned to give others a chance (as per our GSSoC anti-hoarding policy).

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Happy coding! 🚀