Cleanup API doc demos (#400)

* Remove test API

* Remove nullable examples

Author: sserrata

demo/docusaurus.config.js

@@ -239,14 +239,6 @@ const config = {
             specPath: "examples/food/yogurtstore/openapi.yaml",
             outputDir: "docs/food/yogurtstore",
           },
-          config: {
-            specPath:
-              "https://raw.githubusercontent.com/PaloAltoNetworks/pan.dev/master/openapi-specs/access/prisma-access-config/AddressGroups.yaml",
-            outputDir: "docs/config",
-            sidebarOptions: {
-              groupPathsBy: "tag",
-            },
-          },
         },
       },
     ],

demo/examples/petstore.yaml

@@ -1060,12 +1060,10 @@ components:
           description: The name given to a pet
           type: string
           example: Guru
-          nullable: true
         photoUrls:
           description: The list of URL to a cute photos featuring pet
           type: array
           maxItems: 20
-          nullable: true
           xml:
             name: photoUrl
             wrapped: true
@@ -1079,7 +1077,6 @@ components:
           description: Tags attached to the pet
           type: array
           minItems: 1
-          nullable: true
           xml:
             name: tag
             wrapped: true
@@ -1104,7 +1101,6 @@ components:
     Tag:
       title: tag
       type: object
-      nullable: true
       properties:
         id:
           description: Tag ID

demo/sidebars.js

@@ -70,16 +70,6 @@ const sidebars = {
       },
       items: require("./docs/cos/sidebar.js"),
     },
-    {
-      type: "category",
-      label: "Address Groups",
-      link: {
-        type: "generated-index",
-        title: "Address Groups",
-        slug: "/category/config-api",
-      },
-      items: require("./docs/config/sidebar.js"),
-    },
     {
       type: "category",
       label: "Burgers",