Change Event System link to point at docs site instead of local markdown file

Author: mstrhakr

README.md

@@ -160,7 +160,7 @@ Plugins can respond to system events by placing executable scripts in their `eve
 | `stopped` | Array has stopped |
 | `poll_attributes` | SMART data polled |
 
-See [Event System](docs/events.md) for full details.
+See [Event System](https://plugin-docs.mstrhakr.com/docs/events.html) for full details.
 
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