Setup basic page support

JIRA: SPB-50
Can we make this prettier? :blush:

``` json
[
  {
    "pk": 1,
    "model": "sites.site",
    "fields": {
      "domain": "sanaprotocolbuilder.me",
      "name": "Sana Protocol Builder"
    }
  },
  {
    "pk": 1,
    "model": "flatpages.flatpage",
    "fields": {
      "registration_required": false,
      "title": "About",
      "url": "\/about\/",
      "template_name": "webapp\/default.html",
      "sites": [
        1
      ],
      "content": "",
      "enable_comments": false
    }
  },
  {
    "pk": 2,
    "model": "flatpages.flatpage",
    "fields": {
      "registration_required": false,
      "title": "Documentation",
      "url": "\/documentation\/",
      "template_name": "webapp\/default.html",
      "sites": [
        1
      ],
      "content": "",
      "enable_comments": false
    }
  }
]
```