move everything around, add more content and a first test for images

docs/src/demos/Nodes/Image/index.spec.js

@@ -0,0 +1,27 @@
+context('/api/nodes/image', () => {
+  before(() => {
+    cy.visit('/api/nodes/image')
+  })
+
+  beforeEach(() => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.setContent('<p>Example Text</p>')
+      editor.selectAll()
+    })
+  })
+
+  it('should add an img tag with the correct URL', () => {
+    cy.window().then(win => {
+      cy.stub(win, 'prompt').returns('foobar.png')
+
+      cy.get('.demo__preview button:first')
+        .click()
+
+      cy.window().its('prompt').should('be.called')
+
+      cy.get('.ProseMirror')
+        .find('img')
+        .should('have.attr', 'src', 'foobar.png')
+    })
+  })
+})