fix: Move content into to frontend directory

Doing this BEFORE the merge prevents a lot of merge conflicts.

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

frontend/cypress/e2e/intro.spec.ts

@@ -0,0 +1,60 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/* eslint-disable @typescript-eslint/no-unsafe-call */
+describe('Intro page', () => {
+  beforeEach(() => {
+    cy.intercept('public/intro.md', 'test content')
+    cy.visitHome()
+  })
+
+  describe('customizable content', () => {
+    it('fetches and shows the correct intro page content', () => {
+      cy.getIntroBody().contains('test content')
+    })
+
+    it("won't show anything if no content was found", () => {
+      cy.intercept('public/intro.md', {
+        statusCode: 404
+      })
+      cy.visitHome()
+
+      cy.getByCypressId('documentIframe').should('not.exist')
+    })
+  })
+
+  describe('features button', () => {
+    it('is hidden when logged in', () => {
+      cy.getByCypressId('features-button').should('not.exist')
+    })
+
+    it('is visible when logged out', () => {
+      cy.logout()
+      cy.getByCypressId('features-button').should('exist')
+    })
+  })
+
+  describe('sign in button', () => {
+    it('is hidden when logged in', () => {
+      cy.getByCypressId('sign-in-button').should('not.exist')
+    })
+
+    it('is visible when logged out', () => {
+      cy.logout()
+      cy.getByCypressId('sign-in-button').should('exist')
+    })
+  })
+
+  describe('version dialog', () => {
+    it('can be opened and closed', () => {
+      cy.getByCypressId('version-modal').should('not.exist')
+      cy.getByCypressId('show-version-modal').click()
+      cy.getByCypressId('version-modal').should('be.visible')
+      cy.getByCypressId('version-modal').find('.modal-header .btn-close').click()
+      cy.getByCypressId('version-modal').should('not.exist')
+    })
+  })
+})