CMS - hotfix displaying pages in netlify-cms

Weird issues when `extension: html.md`
1. no settings displayed
2. only first page displayed in sezona17-18
3. no pages when I go back from sezona17-18 article

With  `extension: md`
1. two pages are displayed
2. second page displayed after scroll down
3. visible pages after going back

Extensions with multiple parts aren't fully supported (or contain bugs)
https://github.com/netlify/netlify-cms/blob/master/website/site/content/docs/configuration-options.md#extension-and-format
https://github.com/netlify/netlify-cms/issues/317#issuecomment-398772968
https://github.com/netlify/netlify-cms/pull/1123