Transpiled source is displayed instead of raw typescript

[andrewvc]

Without a tsconfig.json file like the one in the root of this project present synthetics will only show the transpiled (ugly) JS. I think the solution here is to bring back what we used to do, where we hard-coded the tsconfig settings when requiring 'typescript'. This was introduced here: https://github.com/elastic/synthetics/pull/98/files#diff-fa8d4e24d8399e8350f1c8bad05df53e8032ea995835bf911507015e2db61cddR115 but later backed out.

@vigneshshanmugam I'd be curious as to your thoughts here