update doc and remove unnecessary files

Author: arobrien

README.md

@@ -1,6 +1,7 @@
 # nbchrome
 A lightweight viewer for Jupyter Notebooks as a Chrome Extension.
 This project differentiates from Jupyter Notebook Viewer by not requiring any server process.
+No data is sent or received over the network by the plugin.
 
 **Note: This project is currently at the proof-of-concept phase and some functionality may be missing.
 I would appreciate pull requests or git issues.**
@@ -11,10 +12,12 @@ I would appreciate pull requests or git issues.**
 
 Installation:
 1. Download to a local folder.
-2. Go to chrome://extensions and enable developer mode in the top-right corner.
-3. Click 'Load unpacked' from the top-left corner and select the extension.
-4. Open any .ipynb file in Chrome.
-5. If you edit or update the extension, hit the reload button for the extension in the extension manager.
+2. Install nodejs
+3. npm install
+4. npm build-dev
+5. Go to chrome://extensions and enable developer mode in the top-right corner.
+6. Click 'Load unpacked' from the top-left corner and select the extension folder.
+7. Open any .ipynb file in Chrome.
 
 At the moment, if you hit an error it's probably because of some element that the script isn't handling.
 If this happens it will probably just show you the raw json and look like nothing else happened.