feat: add hide property to collections (#3618) (#3643)

packages/netlify-cms-core/src/components/App/App.js

@@ -50,7 +50,12 @@ const ErrorCodeBlock = styled.pre`
 `;
 
 const getDefaultPath = collections => {
-  return `/collections/${collections.first().get('name')}`;
+  const first = collections.filter(collection => collection.get('hide') !== true).first();
+  if (first) {
+    return `/collections/${first.get('name')}`;
+  } else {
+    throw new Error('Could not find a non hidden collection');
+  }
 };
 
 const RouteInCollection = ({ collections, render, ...props }) => {

packages/netlify-cms-core/src/components/Collection/Sidebar.js

@@ -133,7 +133,12 @@ class Sidebar extends React.Component {
             value={query}
           />
         </SearchContainer>
-        <SidebarNavList>{collections.toList().map(this.renderLink)}</SidebarNavList>
+        <SidebarNavList>
+          {collections
+            .toList()
+            .filter(collection => collection.get('hide') !== true)
+            .map(this.renderLink)}
+        </SidebarNavList>
       </SidebarContainer>
     );
   }

packages/netlify-cms-core/src/constants/configSchema.js

@@ -118,6 +118,7 @@ const getConfigSchema = () => ({
           preview_path_date_field: { type: 'string' },
           create: { type: 'boolean' },
           publish: { type: 'boolean' },
+          hide: { type: 'boolean' },
           editor: {
             type: 'object',
             properties: {