v1.0.0 - Email Newsletter page

[athu-tran]

As a general user, I want to subscribe to an email newsletter so I can receive CVE Program news in my inbox.

AC:

• Create Email Newsletter page (refer to screenshot for UI design)
  • Updated overview text from @rroberge (under Subscribe to our newsletter): "CVE Announce, our monthly e-newsletter, provides general news about the CVE Program such as new CNAs, our latest blogs and podcasts, new website features, CVE in the news, etc."
    Edited
• Link to this page from News page
• Link existing Footer >Media > "Sign up for e-newsletter" to this page (hold off on this until v1.1.0 - Migrate newsletter functionality #181 is ready)

Provides UI for #181

[david-waltermire]

I approve this user story.