Support multiple markdown files properly

Describe the bug Storybook/addon-notes Currently the storybook/addon-notes expects one markdown file. It would be nice, if you could serve an array of markdown files. If I simply concatenate two markdown files, the first line of formatted markdown will not get rendered properly.

To Reproduce Steps to reproduce the behavior:

1. Create markdownFileA.md. Content: Text
2. Create markdownFileB.md, content: # headline
3. Create a story with addon-notes:

{
        notes: {markdown: markdownFileA + markdownFileB}
}

Expected behavior The contents of both markdown files should be displayed correctly

Screenshots

System:

• OS: Windows7
• Browser: Chrome
• Addons: Notes
• Version: 5.0.11

[shilman]

FYI addon-notes is being superceded by addon-docs, which fixes some problems with notes and is also more full-featured. It’s reached release candidate (RC) status and will be properly released soon. Please give it a try! https://medium.com/storybookjs/storybook-docspage-e185bc3622bf

[shilman]

What if you do:

notes: { markdown: `${markdownFileA}\n\n${markdownFileB}` }