Positioning Grid Elements : Add Grid Garden assignment & remove additional resources

[sameeksha-dalvi]

Because

To add CSS Grid Garden levels 1–17 and remove the Additional Resources section.

This PR

• Adds CSS Grid Garden levels 1–17 as an assignment.
• Removes the Additional Resources section from the lesson.

Issue

Closes #30740

Additional Information

Pull Request Requirements

• I have thoroughly read and understand The Odin Project curriculum contributing guide
• The title of this PR follows the location of change: brief description of change format, e.g. Intro to HTML and CSS lesson: Fix link text
• The Because section summarizes the reason for this PR
• The This PR section has a bullet point list describing the changes in this PR
• If this PR addresses an open issue, it is linked in the Issue section
• If any lesson files are included in this PR, they have been previewed with the Markdown preview tool to ensure it is formatted correctly
• If any lesson files are included in this PR, they follow the Layout Style Guide

[ManonLef]

Thanks for making these changes!