Upgrade sass and prettier. Add snapshot tests.

For:
* About
* AccessibilityStatement
* App
* Appendix
* Demo
* Faq
* FillForms
* Manual
* OeciLogin
* PartnerInterest
* PrivacyPolicy
* RecordSearch
* Rules

- Update package.json
* Change node-sass dependency to sass
* Upgrade prettier to match project root .pre-commit-config.yaml

Author: monocle

src/frontend/package-lock.json

@@ -23,8 +23,7 @@
     "lint-staged": "^8.2.1",
     "lodash": "^4.17.20",
     "moment": "^2.24.0",
-    "node-sass": "^4.13.1",
-    "prettier": "^1.19.1",
+    "prettier": "2.0.5",
     "react": "^16.12.0",
     "react-dev-utils": "10.1.0",
     "react-dom": "^16.12.0",
@@ -36,6 +35,7 @@
     "redux": "^4.0.5",
     "redux-mock-store": "^1.5.4",
     "reselect": "^4.0.0",
+    "sass": "^1.57.1",
     "tachyons": "^4.11.1",
     "typescript": "3.7.2"
   },

src/frontend/package.json

@@ -0,0 +1,16 @@
+import React from "react";
+import { BrowserRouter } from "react-router-dom";
+import renderer from "react-test-renderer";
+
+import About from "./";
+
+it("renders correctly", () => {
+  const tree = renderer
+    .create(
+      <BrowserRouter>
+        <About />
+      </BrowserRouter>
+    )
+    .toJSON();
+  expect(tree).toMatchSnapshot();
+});