Add fork, publish, push, release and star events

[WillyJL]

What the title says, here are some examples of the end results:

🔱 Forked from JasonEtco/activity-box
💯 Published JasonEtco/activity-box
💾 Pushed to JasonEtco/activity-box
💾 Pushed 3x to JasonEtco/activity-box
✨ Released 1.1 on JasonEtco/activity-box
⭐ Starred JasonEtco/activity-box

Notes:

• Published occurs when a private repository becomes public
• When there is more than 1 consequent push to the same repo, it collapses to 1 entry (Pushed 3x to ...)
• Releases show the tag name (Released 1.1 on ...)
• Emojis could be better, I picked the first ones that seemed remotely relevant