* Revert "Revert "add dark mode support (#53)" (#54)"
This reverts commit 2161f4d5f1.
* switch to cssVariables: false
* bring back darkmode for DemoFlag
* fix suspense example
* fix skeleton example
* throw when decide returns undefined
* throw on undefined unless defaultValue is defined
* wip
* bring back JsonValue
* do not enforce on typescript level for now
* add changeset
* mention exported types
* add precise types
* fix summer-sale example