Change lines of code of JavaScript to 60 for Hello World example in docs
Change lines of code of JavaScript to 60 for Hello World example in docs

A simple hello world program now produces about 60 lines of code:
```
~/projects/learn-idris ξ cat hello.idr
main : IO ()
main = putStrLn "Hello, world!"
~/projects/learn-idris ξ idris --codegen javascript hello.idr -o hello.js
~/projects/learn-idris ξ wc -l hello.js
61 hello.js
```

Far from 1500! Hooray :)

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