Merge pull request #46 from gopherjs/playground-simplify-description

playground/README: Simplify description, remove out of date info.

Author: neelance

playground/README.md

@@ -1,8 +1,6 @@
 # GopherJS Playground
 
-The playground is a place where users can explore GopherJS without needing to install anything, or to share code with others. Our motivation should be that a potential user could easily be turned of by a bad experience here.
-
-A secondary motivation is making the playground usable for other projects, such as in the GopherJS book, a GopherJS codewalk, or custom interactive environments using other packages.
+The playground is a place where users can explore GopherJS without needing to install anything, or to share code with others.
 
 ## Development