feat: support dark mode config

[marythought]

Adds dark mode support

Preview: http://opentdf-docs-preview-dark-mode.surge.sh/

closes #178

[gemini-code-assist]

Summary of Changes

Hello @marythought, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces dark mode functionality to the documentation site by modifying the Docusaurus theme configuration. This enhancement allows users to choose their preferred visual theme and ensures the site respects their operating system's color scheme settings, improving accessibility and user experience.

Highlights

• Dark Mode Configuration: The Docusaurus configuration has been updated to enable dark mode support. Specifically, the disableSwitch property for colorMode was changed from true to false, allowing users to manually toggle themes. Additionally, respectPrefersColorScheme was set to true, ensuring the site automatically adapts to the user's system-wide color scheme preference.

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[gemini-code-assist]

Code Review

This pull request correctly enables dark mode support for the Docusaurus site. The changes to docusaurus.config.ts enable the theme switcher and make the site respect the user's system color scheme preference. This is a straightforward and effective change. The necessary styles for dark mode appear to be in place, making this a complete feature implementation. I see no issues with this change.