Single file collections (#132)

* Files based collections skeleton

* listing file based cards

* create new entry with collection

* moved lookupEntry to main backend

* Editing single page Collections file

* List widget basic implementation

* Adjustments for test-repo

* check if value exists before trying to iterate over

example/index.html

@@ -30,7 +30,7 @@
     },
     _data: {
       "settings.json": {
-        content: '{"site_title": "CMS Demo", "posts": {"front_limit": 5, "author": "Matt Biilmann"}}'
+        content: '{"site_title": "CMS Demo"}'
       },
       "authors.yml": {
         content: 'authors:\n  - name: Mathias\n    description: Co-founder @ Netlify\n'