refactor: redirect support questions to discussions including form + more links

Discussions apparently onyl support forms see,
so I quickly used ChatGPT to convert the Markdown file into the YAMl format
and after telling the format it seems to have done that in a good eay:
https://chat.openai.com/share/99718495-28d0-4382-ab5e-6a4a733c1ccb

(maybe GitHub introduced that after end of 2021 hehe, so the LLM could not know that)

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,13 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Question and support
+    url: https://github.com/orgs/PrivateBin/discussions/new?category=q-a
+    about: Your setup is not working and you need help or you have a question regarding
+  PrivateBin
+  - name: Problem with the container image
+    url: https://github.com/PrivateBin/docker-nginx-fpm-alpine/issues/new
+    about: Please report all problems that apply **only** to the official (Docker) image `docker-nginx-fpm-alpine` here.
+  - name: Security issue
+    url: https://github.com/PrivateBin/PrivateBin/security/policy
+    about: Please report security vulnerabilities and other security issues here.
+