Replace localhost with 127.0.0.1 in development environment

https://developer.spotify.com/blog/2025-02-12-increasing-the-security-requirements-for-integrating-with-spotify

Author: watsonbox

.env

@@ -0,0 +1 @@
+HOST=127.0.0.1

README.md

@@ -122,7 +122,7 @@ In the project directory, first run `yarn install` to set up dependencies, then
 **`yarn start`**
 
 Runs the app in the development mode.\
-Open [http://localhost:3000](http://localhost:3000) to view it in the browser.
+Open [http://127.0.0.1:3000](http://127.0.0.1:3000) to view it in the browser.
 
 The page will reload if you make edits.\
 You will also see any lint errors in the console.
@@ -184,7 +184,7 @@ To build and run Exportify with docker, run:
 
 **`docker run -p 3000:3000 exportify`**
 
-And then open [http://localhost:3000](http://localhost:3000) to view it in the browser.
+And then open [http://127.0.0.1:3000](http://127.0.0.1:3000) to view it in the browser.
 
 ## Contributing