v2 Enable local development (#52)

- Create local dev environment
- Add gas-client and google-apps-script-webpack-dev-server packages for development
- Add dev/ wrapper app
- Update webpack config to support development environment
- Redesigned READMEs
- Support typescript
- Update npm scripts
- Organize and update .gitignore file
- Add .vscode settings for clasp files
- Remove tracking for files in dist/

src/client/sidebar-about-page/components/About.jsx

@@ -2,7 +2,17 @@ import React from 'react';
 
 const About = () => (
   <div>
-    <div>Github repo:</div>
+    <p>
+      <b>☀️ React app inside a sidebar! ☀️</b>
+    </p>
+    <p>
+      This is a very simple page demonstrating how to build a React app inside a
+      sidebar.
+    </p>
+    <p>
+      Visit the Github repo for more information on how to use this project.
+    </p>
+    <p>- Elisha Nuchi</p>
     <a
       href="https://www.github.com/enuchi/React-Google-Apps-Script"
       target="_blank"
@@ -10,7 +20,6 @@ const About = () => (
     >
       React + Google Apps Script
     </a>
-    <div>-Elisha Nuchi</div>
   </div>
 );