fix: use env.json in both client and server (#42359)

config/read-env.js

@@ -0,0 +1,60 @@
+const path = require('path');
+
+const envPath = path.resolve(__dirname, '../.env');
+const { error } = require('dotenv').config({ path: envPath });
+
+if (error) {
+  if (process.env.FREECODECAMP_NODE_ENV === 'development') {
+    console.warn('.env not found, please copy sample.env to .env');
+  } else {
+    console.warn(`.env not found. If env vars are not being set another way,
+this could be a problem.`);
+  }
+}
+
+const {
+  HOME_LOCATION: homeLocation,
+  API_LOCATION: apiLocation,
+  FORUM_LOCATION: forumLocation,
+  NEWS_LOCATION: newsLocation,
+  RADIO_LOCATION: radioLocation,
+  CLIENT_LOCALE: clientLocale,
+  CURRICULUM_LOCALE: curriculumLocale,
+  SHOW_LOCALE_DROPDOWN_MENU: showLocaleDropdownMenu,
+  ALGOLIA_APP_ID: algoliaAppId,
+  ALGOLIA_API_KEY: algoliaAPIKey,
+  PAYPAL_CLIENT_ID: paypalClientId,
+  DEPLOYMENT_ENV: deploymentEnv,
+  SHOW_UPCOMING_CHANGES: showUpcomingChanges
+} = process.env;
+
+const locations = {
+  homeLocation,
+  apiLocation,
+  forumLocation,
+  newsLocation,
+  radioLocation: !radioLocation
+    ? 'https://coderadio.freecodecamp.org'
+    : radioLocation
+};
+
+module.exports = Object.assign(locations, {
+  clientLocale,
+  curriculumLocale,
+  showLocaleDropdownMenu: showLocaleDropdownMenu === 'true',
+  deploymentEnv,
+  environment: process.env.FREECODECAMP_NODE_ENV || 'development',
+  algoliaAppId:
+    !algoliaAppId || algoliaAppId === 'app_id_from_algolia_dashboard'
+      ? null
+      : algoliaAppId,
+  algoliaAPIKey:
+    !algoliaAPIKey || algoliaAPIKey === 'api_key_from_algolia_dashboard'
+      ? null
+      : algoliaAPIKey,
+  paypalClientId:
+    !paypalClientId || paypalClientId === 'id_from_paypal_dashboard'
+      ? null
+      : paypalClientId,
+  showUpcomingChanges: showUpcomingChanges === 'true'
+});