feat: add authors to the left menu and improve the disabled dark mode toggle

[flexiondotorg]

Description

A small collection of little improvements:

• Add authors in the left menu
• Make the disabled dark mode toggle look correct
• Update the pubspec.yaml description to match the project tagline

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation (updates the documentation)

Checklist:

• I have performed a self-review of my code
• I have tested my code in common scenarios and confirmed there are no regressions
• I have added comments to my code, particularly in hard-to-understand sections