[Task] Complete build scripts in package.json with documentation

[dynamsoft-h]

1. Add local resource hosting build scripts from docs directly into package.json to reduce extra steps in documentation, to make development, easier, and to make internal testing easier. Remove the instructions in the documentation after adding the scripts.
2. Add source map enabled build scripts for debugging purposes.
3. Add production optimisations to production build.
4. Allow mixing and matching these scripts easily (e.g. CDN + source maps, local resources + source maps, local resources without source maps, etc.)
5. Reference all scripts in documentation.