Email verification

Set up a rate-my-student-home email to send emails from, create a verification link lasting 48h that needs to be clicked before a review is shown publically on the website.

Snippet from previous project:
```
# __init__.py
from flask_redmail import RedMail
#Emailer
app.config["EMAIL_HOST"] = email_host
app.config["EMAIL_PORT"] = email_port
app.config['EMAIL_USER'] = email_user
app.config['EMAIL_PASSWORD'] = email_password
class Mailer():
def __init__(self):
self.sender = RedMail(app)

def send_html(self, to, html, subject):
self.sender.send(
subject=subject,
receivers=[to],
html=html
)

mailer = Mailer()

# routes.py
from app import mailer
from itsdangerous import URLSafeTimedSerializer, SignatureExpired

s = URLSafeTimedSerializer("SECRET_KEY_CHANGE_ME")

token = s.dumps(user.email, salt="email-confirm")
confirm_url = url_for("confirm_email", token=token, _external=True)
email_content = render_template("email_accountcreation.html", confirm_url=confirm_url)
mailer.send_html(user.email, email_content, "Registration")

@app.route("/confirm_email/")
def confirm_email(token):
try:
email = s.loads(token, salt="email-confirm", max_age=172800)
except SignatureExpired:
flash("The token is expired!", "danger")

# email_accountcreation.html

Thank you for registering with Toolshare!

Please verify your email by clicking the following link

{{ confirm_url }}

```
In future we can host our own mail server