* Create .mdx for ColorPicker component group

Describes the building blocks of the component and how they work together.

* Rename ColorPicker.mdx to ColorPicker.story.mdx

* Update packages/grafana-ui/src/components/ColorPicker/ColorPicker.story.mdx

Clean up tags

Co-Authored-By: Tobias Skarhed <1438972+tskarhed@users.noreply.github.com>

* Update packages/grafana-ui/src/components/ColorPicker/ColorPicker.story.mdx

Co-Authored-By: Tobias Skarhed <1438972+tskarhed@users.noreply.github.com>

Co-authored-by: Tobias Skarhed <1438972+tskarhed@users.noreply.github.com>