This adds a new local package called '@pegjs/publish-dev' that will be run by the CI after all other tasks.
'@pegjs/publish-dev' will, as the name implies, publish a new release of pegjs on NPM under the dev tag.
* Move PEG.js from . to packages/pegjs
* Update relevanr paths
* Remove pegjs-dev; Use pegjs directly
* Generate browser files at packages/pegjs/dist
* nyc: exclude website
* website: keep packages folder
* Root package.json is private now