Remove monorepo structure and tooling

[hsubox76]

When this repo was originally created, we expected to have to create 2 npm packages for web and node. This never materialized so I am removing the unnecessary monorepo structure and tooling. This puts the CHANGELOG at the top level and removes the duplicate READMES, making the repo less complicated to read.

• Move contents of packages/main to top level.
• Use top level package.json as json of the actual published package instead of maintaining an umbrella package.json that does not represent a real NPM package
• Remove lerna and its config
• Update paths

[DellaBitta]

Nice finds, @dlarocque .

[DellaBitta]

Complexity reduction, nice work! 👍