Merge hotfix-add-subcribe-button (#30) into master

index.html: Add subscribe button to general meeting notice.

This will allow users to quickly subscribe to the mailing/interest form.
Merge hotfix-adjust-buttons-on-front-page (#31) into master

Make buttons explicit on front page.

Clarify the meaning of 'subscribe' by extending the message and move
icons to the left of the button.
Merge branch 'master' into stable