feat: (docs) introducing in-app surveys section

[ShubhamPalriwala]

What does this PR do?

• Introduces a new In-App Surveys section in the docs (like the Link Surveys)
• Rewrites the Actions section to an Actions Page inside the in app surveys
• Rewrites the Attributes section to an Attributes Page inside the in app surveys
• Writes redirects in the next config for the above

Checklist

Required

• Filled out the "How to test" section in this PR
• Read How we Code at Formbricks
• Self-reviewed my own code
• Commented on my code in hard-to-understand bits
• Ran pnpm build
• Checked for warnings, there are none
• Removed all console.logs
• Merged the latest changes from main onto my branch with git pull origin main
• My changes don't cause any responsiveness issues
• First PR at Formbricks? Please sign the CLA! Without it we wont be able to merge it 🙏

Appreciated

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

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[github-actions]

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

[mattinannt]

@ShubhamPalriwala Thanks for the PR :-) 💪🔥
As I now see the docs I think we should move the entries from the Getting started section also to in-App Surveys as they are also in-app survey specific.
Also I think we should keep Identify Users ( https://formbricks.com/docs/attributes/identify-users ) (below Troubleshooting) and explain the basics of Identified users vs. unidentified users (including setting userId and logout). The extended explanation with how to set attributes in the code should still be in Attributes.

[ShubhamPalriwala]

Hey, thanks for the feedback! Just made the changes, please take a look now 🤞🏼

The new In-App Surveys Section along with the new User Identification Page:

[mattinannt]

@ShubhamPalriwala thank you, looks great! 😊🔥
I only updated the Identify user page a bit in terms of wording and information that might be useful to the user to make a decision what to use.