Use simple hex color in storybook docs

Use simple hex color in storybook docs, so we can avoid documenting the color import, issue visible here:

https://actyx.github.io/industrial-ui/index.html?path=/docs/components-icontextnotification--warning

Open the linked Storybook page and locate the IconTextNotification warning documentation or story. Check how its color is currently referenced, then replace the documented color import with a simple hex color. Done means the warning example renders unchanged and its documentation no longer requires explaining the color import.

Scritto dal modello di indicizzazione a partire dal testo della issue.