Use issue template links to point to HackerOne and help.nextcloud.com

Signed-off-by: Georg Ehrke <developer@georgehrke.com>

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,8 @@
+blank_issues_enabled: false
+contact_links:
+  - name: ❓ Question
+    url: https://help.nextcloud.com/
+    about: I have a question …
+  - name: 🔒 Security Vulnerability
+    url: https://hackerone.com/nextcloud
+    about: Found a security vulnerability?

.github/ISSUE_TEMPLATE/question.md

@@ -1,11 +0,0 @@
----
-name: 🙋 Question
-about: Do you have a question about the app?
-title: ''
-labels: question
-assignees: ''
-version: 0.1
----
-
-This issue tracker is only meant for dealing with bugs and feature requests of the calendar app.
-Please ask your questions at https://help.nextcloud.com/c/apps/calendar.