Remove the Google+ button, and add a HN button

[matin]

No one uses Google+.

HN button code: https://github.com/igrigorik/hackernews-button

This is consistent with the design in #1.

[matin]

@mahmoudimus fixed in https://github.com/balanced/balanced.github.com/commit/60c11f46be41a7a63ed78e3ba706f7b510728367

[matin]

@mahmoudimus the HN button says "submit" even after submitting instead of giving you the ability to upvote through the button

[matin]

nvm. There's a delay.