Update SXP10.4 page with link to SCSE, update forecast dates

[sc-marcusheath]

Description / Motivation

• Update SXP 10.4 downloads page with link to SCSE module
• Update target dates for forthcoming modules

How Has This Been Tested?

• Tested on localhost:3000

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

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Name	Status	Preview	Comments	Updated (UTC)
developer-portal	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 7, 2024 4:50am

[sc-marcusheath]

Tested in Vercel Preview. @ DevRel team - please commit to Main.