Update Starter to Use Decap CMS (#910)

* Reference new Decap CMS packages

* Update media package references

Author: ErikAGriffin

CONTRIBUTING.md

@@ -14,7 +14,7 @@ bootstrap and run the development server using `yarn develop`.
 Since this starter using the [netlify-dev](https://www.netlify.com/products/dev/#how-it-works), there could be further issues you, please check the [netlify-dev](https://github.com/netlify/netlify-dev) repository for further information and set up questions. 
 
 ```sh
-$ git clone https://github.com/netlify-templates/gatsby-starter-netlify-cms
+$ git clone https://github.com/decaporg/gatsby-starter-decap-cms
 $ yarn 
 ```
 

README.md

@@ -63,9 +63,9 @@ $ netlify dev # or ntl dev
 Media Libraries have been included in this starter as a default. If you are not planning to use `Uploadcare` or `Cloudinary` in your project, you **can** remove them from module import and registration in `src/cms/cms.js`. Here is an example of the lines to comment or remove them your project.
 
 ```javascript
-import CMS from "netlify-cms-app";
-// import uploadcare from 'netlify-cms-media-library-uploadcare'
-// import cloudinary from 'netlify-cms-media-library-cloudinary'
+import CMS from "decap-cms-app";
+// import uploadcare from 'decap-cms-media-library-uploadcare'
+// import cloudinary from 'decap-cms-media-library-cloudinary'
 
 import AboutPagePreview from "./preview-templates/AboutPagePreview";
 import BlogPostPreview from "./preview-templates/BlogPostPreview";
@@ -81,17 +81,17 @@ CMS.registerPreviewTemplate("products", ProductPagePreview);
 CMS.registerPreviewTemplate("blog", BlogPostPreview);
 ```
 
-Note: Don't forget to also remove them from `package.json` and `yarn.lock` / `package-lock.json` using `yarn` or `npm`. During the build netlify-cms-app will bundle the media libraries as well, having them removed will save you build time.
+Note: Don't forget to also remove them from `package.json` and `yarn.lock` / `package-lock.json` using `yarn` or `npm`. During the build decap-cms-app will bundle the media libraries as well, having them removed will save you build time.
 Example:
 
 ```
-yarn remove netlify-cms-media-library-uploadcare
+yarn remove decap-cms-media-library-uploadcare
 ```
 
 OR
 
 ```
-yarn remove netlify-cms-media-library-cloudinary
+yarn remove decap-cms-media-library-cloudinary
 ```
 
 ## Getting Started (Without Netlify)

gatsby-config.js

@@ -63,7 +63,7 @@ module.exports = {
       },
     },
     {
-      resolve: "gatsby-plugin-netlify-cms",
+      resolve: "gatsby-plugin-decap-cms",
       options: {
         modulePath: `${__dirname}/src/cms/cms.js`,
       },