feat: add email ngromeconf

[GMalacaria]

I want to add the ngromeconf@gmail.com email to specific section and pages

• [x] Footer: add new email icon instead of slack icon
• [ ] About page: add email in addition to the socials link
• [x] Terms and privacy: change the email angularroma@gmail.com with the conference email

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[GMalacaria]

@lucianomurr i didnt understand this? 'About page: add email in addition to the socials link'

[lucianomurr]

I think that could be enough!