chore: Clean up unused files, imports, and work on getting end-to-end tests and unit tests running (#2272)

extensions/dicom-pdf/.webpack/webpack.dev.js

@@ -1,8 +0,0 @@
-const path = require('path');
-const webpackCommon = require('./../../../.webpack/webpack.commonjs.js');
-const SRC_DIR = path.join(__dirname, '../src');
-const DIST_DIR = path.join(__dirname, '../dist');
-
-module.exports = (env, argv) => {
-  return webpackCommon(env, argv, { SRC_DIR, DIST_DIR });
-};