[PR] update bundler link, add more instructions for setting up npm

Summary: Closes facebook#3726

Differential Revision: D4888184

Pulled By: nmote

fbshipit-source-id: 4dcdc4f4365bc713f2e8030163cb0eca0f4a3306

website/README.md

@@ -22,7 +22,7 @@ pre-installed with Ruby, but you may need to update RubyGems (via
 
 - [Ruby](http://www.ruby-lang.org/) (version >= 1.8.7)
 - [RubyGems](http://rubygems.org/) (version >= 1.3.7)
-- [Bundler](http://gembundler.com/)
+- [Bundler](http://bundler.io/)
 
 The version of the Pygment syntax highlighter used by Jekyll requires Python
 2.7.x (not 3.x). macOS comes pre-installed with Python 2.7, but you may need to

website/en/docs/_install/setup-npm.md

@@ -21,12 +21,25 @@ npm install --save-dev flow-bin
 
 **Run Flow:**
 
+The first time, run:
+
+```sh
+npm run flow init
+```
+
+```
+> [email protected] flow /Users/Projects/my-flow-project
+> flow "init"
+```
+
+After running `flow` with `init` the first time, run:
+
 ```sh
 npm run flow
 ```
 
 ```
-> [email protected] flow /Users/jimi/Projects/my-flow-project
+> [email protected] flow /Users/Projects/my-flow-project
 > flow
 
 No errors!