clarify README section on running lifite

- remove mention of components - we are not using it any more
- suggest using yarn over npm - we have yarn.lock
- ignore package-lock.json

.gitignore

@@ -6,3 +6,4 @@ public/scripts/
 .project
 .settings
 .DS_Store
+package-lock.json

.npmignore

@@ -1,5 +1,4 @@
 bin
-components
 public/stylesheets/*css
 public/stylesheets/*css.gz
 public/scripts/
@@ -9,4 +8,3 @@ templates
 History.md
 .travis.yml
 .jshintrc
-yarn.lock

Readme.md

@@ -28,12 +28,11 @@ Clone this repo (or your fork)
 
     git clone [email protected]:pirxpilot/liftie.git && cd liftie
 
-Install dependencies with npm:
+Install dependencies:
 
-    npm install
+    yarn
 
-Build client side scripts: liftie is using [component](https://github.com/component/component) -
-make will install all external components and trigger component build for you.
+Build client side scripts: `make` will install all external components and trigger component build for you.
 
     make