Add mandatory unlimited traffic limit

In order to not having a case like this again: Sommerwiesel/invidious#6 (comment)

Author: unixfox

.github/ISSUE_TEMPLATE/new_instance.yaml

@@ -31,6 +31,8 @@ body:
         required: true
       - label: "Instance has an automatic hourly restart setup of Invidious"
         required: true
+      - label: "Instance has unlimited traffic/bandwidth or close to unlimited (100TB max)"
+        required: true
 
 
   - type: checkboxes