Make subscription button look nicer

[dhood]

I put this button in in a hurry.. can someone center it?

[dhood]

@itzJcovington thanks for centering! if you're interested, I think this can still look better :eyes: maybe with smaller font so it's less gaudy, and the mouse-over colouring is not great:

not to mention how it looks on mobile :face_exhaling:

if you can help with these things it'll do wonders for the landing page!!

• [ ] make smaller
• [ ] fix mouseover colour
• [ ] fix mobile version (shrink browser window to get it to activate for testing)