Werk #11498: The dark theme is now used as default theme

Component	User interface
Title	The dark theme is now used as default theme
Date	Oct 1, 2020
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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