Simplify hello world sample

hello/srv/world.cds

@@ -1,3 +1,3 @@
-service say @(path: '/say') {
+service say {
   function hello (to:String) returns String;
-}
+}

hello/test/hello-world-test.js

@@ -1,10 +0,0 @@
-const cds = require ('@sap/cds')
-describe('Hello world!', () => {
-    const {GET} = cds.test.in(__dirname,'../srv').run('serve', 'world.cds')
-
-    it('should say hello with class impl', async () => {
-        const {data} = await GET`/say/hello(to='world')`
-        expect(data.value).to.match(/Hello world.*typescript.*/i)
-    })
-
-})

hello/test/test.http

@@ -1 +1,5 @@
-GET http://localhost:4004/say/hello(to='world')
+GET http://localhost:4004/odata/v4/say/hello
+###
+
+GET http://localhost:4004/odata/v4/say/hello(to='me')
+###

test/hello-world.test.js

@@ -5,7 +5,7 @@ describe('cap/samples - Hello world!', () => {
   const { GET, expect } = cds.test (__dirname+'/../hello')
 
   it('should say hello with class impl', async () => {
-    const {data} = await GET `/say/hello(to='world')`
+    const {data} = await GET `/odata/v4/say/hello(to='world')`
     expect(data.value).to.eql('Hello world!')
   })