Adding Linting and Formatting (#77)

Addresses #11 item "Linting/formatting (eg eslnt, prettier)":
* Adding eslint, prettier, and config targeting Google, typescript, and both nodejs and client builds
* Addressing linter-found issues
* Adding lint and lint:fix commands
* Adding documentation
* Renaming workflow and adding lint check
* Adding documentation about VSCode linting/formatting, ran formatting on a few files, set up exclude list for gatsby develop, setup build to fail on error

client/src/pages/index.tsx

@@ -1,15 +1,14 @@
-import * as React from "react"
+import * as React from 'react';
 import Layout from '../components/layout';
 // markup
 const IndexPage = () => {
-  
   return (
     <Layout>
       <main>
         <h2>Subheader</h2>
       </main>
     </Layout>
-  )
-}
+  );
+};
 
 export default IndexPage;