Venter can share site via email

[conatus]

User Story

• As a Venter
• So that I can share this site with people and advocate for the rights of renters politically
• I want to be able to share the site via email

[conatus]

Icon is here https://github.com/commonknowledge/vent-your-rent/issues/15#issuecomment-558069217 - simply needs hooking up.