Set theme in splash component

[peterjokumsen]

Summary

To try and fix flash of dark to light theme after primary component loaded, updated splash component to set theme.

Changes Made

• Moved providers into app.config.ts to allow setting theme.
• Updated splash component to set first available theme.
• Looks like moving the providers around helped with initial load bundle size.

Expand for optional sections

## Screenshots ## Related issues Related to #67 #86 ## Testing instructions Plan to test in PR workflow (Should be able to check on lighthouse reports)

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 86.92%. Comparing base (e6d57ef) to head (f8743e9). Report is 7 commits behind head on main.

Additional details and impacted files

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⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 64	🟢 100	🟢 96	🟢 92	🟢 100	Report
/development-notes	🟢 97	🟢 100	🟢 96	🟢 92	🟢 100	Report
/not/found	🟢 97	🟢 100	🟢 96	🟢 92	🟢 100	Report