docs: improve env var notes

README.md

@@ -12,14 +12,16 @@ it directly.
 
 ### Adding a new environment configuration variable
 
-Any new environment configuration variable must be registered in several places:
+Any new environment / configuration variable must be registered in several places:
 
-* [`./create_config_prod.js`](./create_config_prod.js): mapping the environment variable to a config object entry for 
-  production
-* [`./webpack.config.js`](./webpack.config.js): setting a default value for Webpack building
-* [`./src/public/config.js`](./src/public/config.js): creating the shape of the global config object
-* [`./src/js/config.ts`](./src/js/config.ts): loading from the global config object (production) or from the environment 
-  via Webpack (development)
+1. [`./create_config_prod.js`](./create_config_prod.js): mapping the environment variable to a config object entry for 
+   production.
+2. [`./webpack.config.js`](./webpack.config.js): setting a default value for the environment variable; used in Webpack development 
+   builds.
+3. [`./src/public/config.js`](./src/public/config.js): creating the shape of the global config object (using the config object entry key, 
+   mapped to in 1.)
+4. [`./src/js/config.ts`](./src/js/config.ts): loading from the global config object (production) via key or from the 
+   environment variable directly, through Webpack replacement (development).
 
 ### Translations in dev mode
 Add your English to French translations in `dist/public/locales/fr/translation_fr.json` for them to appear on the