Spring Cleaning → removing obsolete stuff, and moved non-app things to ./etc (#810)

* Remove obsolete stuff, and moved non-app things to ./etc
* remove test
* Update package-lock

---------

Co-authored-by: Christian Georgi <christian.georgi@sap.com>

test/hello-world.test.js

@@ -1,22 +0,0 @@
-const cds = require('@sap/cds')
-
-describe('cap/samples - Hello world!', () => {
-
-  const { GET, expect } = cds.test (__dirname+'/../hello')
-
-  it('should say hello with class impl', async () => {
-    const {data} = await GET `/odata/v4/say/hello(to='world')`
-    expect(data.value).to.eql('Hello world!')
-  })
-
-  it('should say hello with another impl', async () => {
-    await cds.serve('say').from(cds.model)
-    .at('/say-again').in(cds.app)
-    .with(srv => {
-      srv.on('hello', (req) => `Hello again ${req.data.to}!`)
-    })
-    const {data} = await GET `/say-again/hello(to='world')`
-    expect(data.value).to.eql('Hello again world!')
-  })
-
-})