Remove Monaco Editor Webpack Plugin and Manually Vendor Editor Workers

[subhankar-panda]

Follows the "manual approach" listed here.

Fixes #314.

The issue with #355 was that it was never able to find the ts worker - this manually tells webpack where to look for the files

[jasonwilliams]

Hey @subhankar-panda thanks for this!
Do you know if there's anything we can do about getting rid of all the language-support we don't need.

When you run yarn build then look in dist folder it generates a lot of js files, for all the different syntaxes it supports, is there a way to just have javascript?