Custom D3 build

Derived from this example and the full D3 build.

To build, do

• npm i;
• Make any changes you need
• npm run build. The newly built js files will be in the ./build directiory.
• To make the commit history clean, revert chnages to the build folder before commiting. Changes to build commited using the below process.

To publish (after commiting your changes):

• npm run build
• Bump the version number MSW-tag in package.json.
• npm run publish. This adds and commits the built files, tags the commit with MSW-tag and git pushs.