In comparison to generic page-wise hot reloading, this technique
requires using dedicated component within a storybook page but
provides greater flexibility e.g. preserving component state across
source reloads.
Closes: #7975
Moreover:
- load asynchronously switch fixed
- storybook refactored to rely on build-in components only
- some explicit sizes/spacings removed
- some bigger components split into smaller
Closes: #7898
Michał Cieślak