Customized email templates for authentication process

[rognierbenoit]

• design email templates (verification, reset password, ...)
• create firebase functions to catch email sending events

Function should be something like:

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();

exports.customizeEmailVerificationEmail = functions.auth.emailAction('email-verification').onCreate((context) => {
  const { email, url } = context.data;

  // Customize the email subject
  const subject = 'Verify Your Email Address';

  // Customize the email body
  const body = `
    Hello,

    Thank you for signing up with our app! To complete your registration, please verify your email address by clicking the link below:

    ${url}

    If you did not request this email verification, please ignore this email.

    Best regards,
    Your App Team
  `;

  // Use the Firebase Admin SDK to send the customized email
  return admin.auth().sendVerificationEmail(email, {
    from: 'no-reply@your-app.com',
    subject: subject,
    body: body,
  });
});