README: remove outdated install instructions

Author: ebidel

readme.md

@@ -48,16 +48,6 @@ cd lighthouse
 # will be cleaner soon.
 cd lighthouse-core
 npm install
-cd ../lighthouse-cli/
-npm install
-# npm link # nah...
-# just use `node lighthouse-cli/index.js` for now
-
-# probably very temporary
-cd lighthouse-core
-npm link
-cd ../lighthouse-cli/
-npm link lighthouse-core
 ```
 
 ## Custom run configuration