Align optional NPM fields

packages/backend/package.json

@@ -3,11 +3,20 @@
   "version": "0.2.5",
   "main": "dist/index.cjs.js",
   "types": "src/index.ts",
-  "private": true,
   "license": "Apache-2.0",
+  "private": true,
   "engines": {
     "node": "12 || 14"
   },
+  "homepage": "https://backstage.io",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/backstage/backstage",
+    "directory": "packages/backend"
+  },
+  "keywords": [
+    "backstage"
+  ],
   "scripts": {
     "build": "backstage-cli backend:build",
     "build-image": "backstage-cli backend:build-image --build --tag example-backend",

packages/catalog-client/package.json

@@ -11,6 +11,15 @@
     "module": "dist/index.esm.js",
     "types": "dist/index.d.ts"
   },
+  "homepage": "https://backstage.io",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/backstage/backstage",
+    "directory": "packages/catalog-client"
+  },
+  "keywords": [
+    "backstage"
+  ],
   "scripts": {
     "build": "backstage-cli build",
     "lint": "backstage-cli lint",

packages/catalog-model/package.json

@@ -11,6 +11,15 @@
     "module": "dist/index.esm.js",
     "types": "dist/index.d.ts"
   },
+  "homepage": "https://backstage.io",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/backstage/backstage",
+    "directory": "packages/catalog-model"
+  },
+  "keywords": [
+    "backstage"
+  ],
   "scripts": {
     "build": "backstage-cli build",
     "lint": "backstage-cli lint",

packages/integration/package.json

@@ -11,6 +11,15 @@
     "module": "dist/index.esm.js",
     "types": "dist/index.d.ts"
   },
+  "homepage": "https://backstage.io",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/backstage/backstage",
+    "directory": "packages/integration"
+  },
+  "keywords": [
+    "backstage"
+  ],
   "scripts": {
     "build": "backstage-cli build",
     "lint": "backstage-cli lint",

plugins/api-docs/package.json

@@ -9,6 +9,15 @@
     "main": "dist/index.esm.js",
     "types": "dist/index.d.ts"
   },
+  "homepage": "https://backstage.io",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/backstage/backstage",
+    "directory": "plugins/api-docs"
+  },
+  "keywords": [
+    "backstage"
+  ],
   "scripts": {
     "build": "backstage-cli plugin:build",
     "start": "backstage-cli plugin:serve",