Issue #85 - Converted newsletter HTML to use template

[EChesters]

• Removed head, footer, and social
• Added newsletter partial and jekyll info like page title
• Realigned HTML

[tanyapowell]

This is the unused file I asked about a few weeks ago in slack. It's not being used and actually needs deleting.

@EChesters do you mind deleting this file?

[EChesters]

I wasn't sure so I did it anyway, but will delete!

[tanyapowell]

:shipit: 👍