Remove $ from terminal commands in README (#130)

* Remove $ from terminal commands in README

So they can be copied and pasted a block at a time

* Remove dependency on globally installed webpack

README.md

@@ -24,23 +24,23 @@ To install `package.json` dependencies in a way where the native
 modules are built with `electron`, run:
 
 ```bash
-$ ./scripts/install.sh
+./scripts/install.sh
 ```
 
 Then, you want to make sure `app/dist` is populated. I recommend
 running `webpack` with `--watch` so that any changes you make
 to the app are detected.
 
 ```bash
-$ cd app/
-$ npm install
-$ npm run dev
+cd app/
+npm install
+npm run dev
 ```
 
 Then you can run in the main directory:
 
 ```bash
-$ npm start
+npm start
 ```
 
 ...to launch the app!