docs(dialog):documentation for the dialog component

[xristianstefanov]

• Added new sections with documentation for Overview, Header, Visibility, Action Buttons.

[github-actions]

Hello @xristianstefanov,

Check the below option if you would like to automatically generate PR to production. The automation uses the branch for the cherry-pick, and then will delete the branch. Please, do not delete it manually.

• create pr to production

[dimodi]

Top suggestions:

• Improve the Overview introduction.
• Make the Basics mode basic :)
• Make the Basics code snippet match the steps above it.
• Use simple, but real-world text for the Dialogs, instead of dummy text.
• Consider using a Primary OK button.
• Consider an Events article that shows one-way binding for Visible.
• Reconsider the need for a Visibility article.