XM Cloud Tutorial - Split Datasources tutorial

[jst-cyr]

Description / Motivation

Fixes #790 . Attempts to make it easier for students by breaking up the component datasources tutorial into two tutorials (one on creating data source items , and one on mapping to the Component).

How Has This Been Tested?

Tested locally and on Vercel.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [X] Documentation update (non-breaking change; modified files are limited to the /data directory or other markdown files)

Checklist:

• [X] I have read the Contributing guide.
• [X] My code/comments/docs fully adhere to the Code of Conduct.
• [ ] My change is a code change.
• [X] My change is a documentation change and there are NO other updates required.
• [ ] My change has new or updated images which are stored in the /public/images folder that need to be migrated to Sitecore DAM