Adds new tile on the admin home page with system data. (#301)

* Adds new tile on the admin home page with system data. Also fixes the active users bug in the pie chart

* Fixes missing parentheses

* Updates user stats cache when signing in

* Reads active number of users from session provider

* Removes unused variable

* Small improvements

* Removes acl properties from system data websocket and performs initial push of data

* fix: remove acl fetch

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Co-authored-by: DecDuck <declanahofmeyr@gmail.com>

server/utils/utils.ts

@@ -0,0 +1,7 @@
+export const getPercentage = (value: number, total: number) => {
+  const percentage = (value * 100) / total;
+  if (!isNaN(percentage)) {
+    return percentage;
+  }
+  return 0;
+};