fix: save raphael to libs and not use github version

Since recent update on github made it uneasy to use scripts directly from this site:
```
Refused to execute script from 'https://raw.github.com/DmitryBaranovskiy/raphael/300aa589f5a0ba7fce667cd62c7cdda0bd5ad904/raphael-min.js' because its MIME type ('text/plain') is not executable, and strict MIME type checking is enabled. 
```
I added local copy of raphael and update urls in examples.