Fix welcome page and outdated warnings on docs

[lucaseduoli]

Summary

This pull request includes a series of updates and improvements to the Notion project. The changes focus on UI adjustments, code cleanup, and content enhancements. Below is a summary of the modifications made:

Changes

1. Removed Margin from Second Level Categories

   • Commit: Removed margin top from second level categories.
   • Description: Adjusted the styling to remove the top margin from second level categories for a more cohesive layout.

2. Code Cleanup

   • Commit: Removed unused classname.
   • Description: Eliminated an unused classname from the codebase to improve code maintainability and readability.

3. Warning Messages Update

   • Commit: Added and removed some outdated warnings.
   • Description: Updated the warning messages by adding relevant warnings and removing outdated ones to ensure accurate and up-to-date information.

4. Introduction Page Enhancement

   • Commit: Added image on introduction page and refactored title.
   • Description: Enhanced the introduction page by adding a new image and refactoring the title for better visual appeal and clarity.

Testing

• Ensure that the removal of the margin does not negatively impact the layout of second level categories.
• Verify that the codebase functions correctly without the removed classname.
• Check that the updated warning messages display accurately where applicable.
• Review the introduction page to confirm the image and title changes render as expected.

Additional Notes

• These changes are intended to improve the overall user experience and code quality.
• No breaking changes are introduced in this pull request.

Please review the changes and provide feedback or approval. Thank you!

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