Switch to npm workspaces (#342)

* Switch to npm workspaces
* Install npm globally

Co-authored-by: Christian Georgi <chgeo@users.noreply.github.com>
Co-authored-by: Christian Georgi <christian.georgi@sap.com>

package.json

@@ -5,17 +5,9 @@
   "repository": "https://github.com/sap-samples/cloud-cap-samples.git",
   "author": "daniel.hutzel@sap.com",
   "dependencies": {
-    "@capire/bookstore": "./bookstore",
-    "@capire/bookshop": "./bookshop",
-    "@capire/common": "./common",
-    "@capire/data-viewer": "./data-viewer",
-    "@capire/fiori": "./fiori",
-    "@capire/hello": "./hello",
-    "@capire/media": "./media",
-    "@capire/orders": "./orders",
-    "@capire/reviews": "./reviews",
     "@sap/cds": ">=5.5.3"
   },
+  "workspaces": ["./*/"],
   "devDependencies": {
     "chai": "^4.3.4",
     "chai-as-promised": "^7.1.1",