Changed env variables prefix

According to Gatsby, for the env variables to be available in client-side (browser) include 'GATSBY' prefic in the beginning

Author: waleedshkt

src/components/Firebase/firebase.js

@@ -1,10 +1,10 @@
 const config = {
- apiKey: process.env.REACT_APP_API_KEY,
- authDomain: process.env.REACT_APP_AUTH_DOMAIN,
- databaseURL: process.env.REACT_APP_DATABASE_URL,
- projectId: process.env.REACT_APP_PROJECT_ID,
- storageBucket: process.env.REACT_APP_STORAGE_BUCKET,
- messagingSenderId: process.env.REACT_APP_MESSAGING_SENDER_ID,
+ apiKey: process.env.GATSBY_API_KEY,
+ authDomain: process.env.GATSBY_AUTH_DOMAIN,
+ databaseURL: process.env.GATSBY_DATABASE_URL,
+ projectId: process.env.GATSBY_PROJECT_ID,
+ storageBucket: process.env.GATSBY_STORAGE_BUCKET,
+ messagingSenderId: process.env.GATSBY_MESSAGING_SENDER_ID,
 };
 
 class Firebase {
@@ -51,7 +51,7 @@ class Firebase {
 
  doSendEmailVerification = () =>
  this.auth.currentUser.sendEmailVerification({
- url: process.env.REACT_APP_CONFIRMATION_EMAIL_REDIRECT,
+ url: process.env.GATSBY_CONFIRMATION_EMAIL_REDIRECT,
  });
 
  doPasswordUpdate = password =>