Setup TS build (failing), rename files to .ts/.tsx

The TypeScript build currently runs but fails for a number of files.
This commit only contains rename operations on the source files.

app/package.json

@@ -36,10 +36,22 @@
     "sharp": "^0.21.3"
   },
   "devDependencies": {
+    "@types/express": "^4.17.0",
+    "@types/express-session": "^1.15.13",
+    "@types/node": "^12.7.1",
+    "@types/react": "^16.9.0",
+    "@types/react-dom": "^16.8.5",
+    "@types/react-router-dom": "^4.3.4",
+    "@types/webpack-env": "^1.14.0",
     "babel-eslint": "^10.0.2",
     "eslint": "^5.16.0",
     "eslint-plugin-jest": "^22.7.2",
     "eslint-plugin-react": "^7.14.2",
-    "razzle": "^3.0.0"
+    "razzle": "^3.0.0",
+    "razzle-plugin-typescript": "^3.0.0",
+    "ts-jest": "^24.0.2",
+    "tslint": "^5.18.0",
+    "tslint-react": "^4.0.0",
+    "typescript": "^3.5.3"
   }
 }

app/razzle.config.js

@@ -1,4 +1,5 @@
 module.exports = {
+    plugins: ['typescript'],
     modify: (config, { target, dev }, webpack) => {
         // load webfonts
         rules = config.module.rules || [];

app/tsconfig.json

@@ -0,0 +1,16 @@
+{
+    "compilerOptions": {
+        "outDir": "./build",
+        "allowJs": true,
+        "target": "es2017",
+        "jsx": "react",
+        "lib": ["es6", "es2015", "es2017", "dom"],
+        "moduleResolution": "node",
+        "resolveJsonModule": true,
+        "allowSyntheticDefaultImports": true,
+        "noImplicitAny": false
+    },
+    "include": [
+        "./src/**/*"
+    ]
+}

app/tslint.json

@@ -0,0 +1,5 @@
+{
+    "rules": {
+      
+    }
+  }