refactor: cleanup readme and remove env variables from ssr package

.docker/nuxt.config.js

@@ -1,8 +1,8 @@
 const config = {
   server: {
-    port: process.env.PORT || 80,
-    host: process.env.HOST || "0.0.0.0",
-  },
+    port: 80,
+    host: '0.0.0.0'
+  }
 };
 
 export default config;

README.md

@@ -71,7 +71,7 @@ $ yarn dev
 # server with hot reload and server-side rendering at localhost:3000
 $ yarn dev:ssr
 
-# build for production and launch server
+# build for production
 # you will need a web server to host the client
 $ yarn build