Init Dark Mode

[AwesomeKesler]

Description This PR adds a system-choice-respecting stylesheet for a functional and brand-independent dark mode to WebchartDocs.

[cloudflare-pages[bot]]

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Latest commit:	20be5f2
Status:	✅  Deploy successful!
Preview URL:	https://3ad02b9d.eh-docs.pages.dev
Branch Preview URL:	https://feature-dark-mode.eh-docs.pages.dev

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[github-actions[bot]]

👋 @AwesomeKesler, Your documentation has been pushed to https://docs-qa.med-web.com/9-merge/ for commit ec1b9c76af3f1a9fd18d3f7943c41a2ca22e5319

[github-actions[bot]]

👋 @wreiske, Your documentation has been pushed to https://docs-qa.med-web.com/9-merge/ for commit 9d9e443a4b0b60ce656c51a00793c7eb5d8a91ab

[github-actions[bot]]

👋 @wreiske, Your documentation has been pushed to https://docs-qa.med-web.com/9-merge/ for commit efc509fd6a6ff704cbe8a7bbdeff97794f734b61

[wreiske]

https://docs-qa.med-web.com/9-merge/wc/functions/system-configuration/document-type-tab/

https://docs-qa.med-web.com/9-merge/wc/functions/system-configuration/chart-tabs/

[github-actions[bot]]

👋 @AwesomeKesler, Your documentation has been pushed to https://docs-qa.med-web.com/9-merge/ for commit 369cdd828426201a01694f409157576afac2ef1d

[github-actions[bot]]

👋 @AwesomeKesler, Your documentation has been pushed to https://docs-qa.med-web.com/9-merge/ for commit 1495bd51b7ad5498afcaf777fabb629d883b86dd

[github-actions[bot]]

👋 @AwesomeKesler, Your documentation has been pushed to https://docs-qa.med-web.com/9-merge/ for commit 4bec6e53b49c349750094528413d02907949fbec

[github-actions[bot]]

👋 @AwesomeKesler, Your documentation has been pushed to https://docs-qa.med-web.com/9-merge/ for commit ed021c5cdf94516394fe3345a25e4f322b7637c2