Add membership benefits to Mail Chimp welcome and renewal messages

[vanderaj]

In our welcome and renewal Mailchimp automation emails, it doesn't mention how to access Secure Flag or We Hack Purple's member benefit. In addition, please highlight the new member portal as the way for them to review their membership and update their data.

Please work with Lisa on some words to:

a) claim their owasp.org email (or recover access to it)
b) how to access each benefit
c) Add membership portal details

to both the new and renewal emails.