v1.2.0

Changes

• Use relative paths for all dependency file links. This fixes an issue with nested local dependencies with Yarn.
• Allow comments in the isolate.config.json file.
• Make excludeLockfile true the default when using PNPM, so that no configuration is needed until we figure out how to make the lockfile work.
• Include the .npmrc file to the isolate output. This fixes a possible npm ci lockfile error for the Node 18 runtime.
• Include the npm-shrinkwrap.json file instead of the lockfile if available.
• Improve package manager detection logic.
• Update and improve the README.

Fixes #13
Closes #14
Fixes #9