:wrench: Adjusted config of send-email to use .env

backend/.env.sample

 PSCALE_DB_USER=myuserpleasechange
 PSCALE_DB_PASSWORD=pscale_pw_abc123efg456hij789
 
-# Brevo Transactional Email API key
+# Brevo Transactional Email API key and other related params
 BREVO_KEY=brevo_api_key
+# Change this to production server
+# BREVO_LINK=localhost:1234
+BREVO_LINK=link_back_to_siimee
+# Change this if multiple templates made via Brevo
+# BREVO_TEMPLATE_ID=1
+BREVO_TEMPLATE_ID=id_of_brevo_template

backend/lib/services/user.js

             emailWasRespondedTo: false,
             accessToken: null,
         }
-
         const sendSmtpEmail = {
             to: [
                 {
                     email: userCredentials.email,
                 },
             ],
-            templateId: 2,
+            templateId: Number(process.env.BREVO_TEMPLATE_ID),
             params: {
                 // TODO: Change this in production...
-                link: `localhost:3000/verify/${hashedSessionToken}`,
+                link: `${process.env.BREVO_LINK}/verify/${hashedSessionToken}`,
             },
         }