chore(plugins): add inngest plugin to directory (#843)

Co-authored-by: Matt Kane <matt.kane@netlify.com>

Author: jpwilliams

site/plugins.json

@@ -710,6 +710,14 @@
     "version": "0.1.2",
     "status": "DEACTIVATED"
   },
+  {
+    "author": "Inngest",
+    "description": "Automatically deploy Inngest functions.",
+    "name": "Inngest",
+    "package": "netlify-plugin-inngest",
+    "repo": "https://github.com/inngest/netlify-plugin-inngest",
+    "version": "1.0.0"
+  },
   {
     "author": "Formspree",
     "description": "Automaticly deploy forms to Formspree via the Formspree CLI",