2.5 -> NEW example: add 1 url or route for a single page storybook with 1 component or widget

[kfarr]

@rostyslavnahornyi I have merged all the PRs related to storybook but I cannot get it to work. Here is what I try:

npm install
npm run storybook
> Error: No configuration files have been found in your configDir (./.storybook).
Storybook needs "main.js" file, please add it (or pass a custom config dir flag to Storybook to tell where your main.js file is located at).

[kfarr]

it works!

[kfarr]

works!