docs(data-source): new file locations, react-scripts to webpack, new env variables for proxy

platform/viewer/.webpack/webpack.pwa.js

@@ -23,10 +23,13 @@ const PUBLIC_DIR = path.join(__dirname, '../public');
 const HTML_TEMPLATE = process.env.HTML_TEMPLATE || 'index.html';
 const PUBLIC_URL = process.env.PUBLIC_URL || '/';
 const APP_CONFIG = process.env.APP_CONFIG || 'config/default.js';
+const PROXY_TARGET = process.env.PROXY_TARGET;
+const PROXY_DOMAIN = process.env.PROXY_DOMAIN;
 
 module.exports = (env, argv) => {
   const baseConfig = webpackBase(env, argv, { SRC_DIR, DIST_DIR });
   const isProdBuild = process.env.NODE_ENV === 'production';
+  const hasProxy = PROXY_TARGET && PROXY_DOMAIN;
 
   const mergedConfig = merge(baseConfig, {
     devtool: isProdBuild ? 'source-map' : 'cheap-module-eval-source-map',
@@ -111,6 +114,11 @@ module.exports = (env, argv) => {
     },
   });
 
+  if (hasProxy) {
+    mergedConfig.devServer.proxy = {};
+    mergedConfig.devServer.proxy[PROXY_TARGET] = PROXY_DOMAIN;
+  }
+
   if (!isProdBuild) {
     mergedConfig.plugins.push(new webpack.HotModuleReplacementPlugin());