misc: update GH issue templates

- Use config.yml to prevent creating issues with a blank template
- Don't use a template to direct people to the forum
- Create a security policy template

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Need help with Jitsi Meet?
+    url: https://community.jitsi.org
+    about: Please ask it in our community.

README.md

@@ -75,11 +75,7 @@ at [8x8](https://8x8.com).
 
 ## Security issues
 
-We take security very seriously and develop all Jitsi projects to be secure and safe.
-
-If you find (or simply suspect) a security issue in any of the Jitsi projects, please send us an email to [email protected].
-
-**We encourage responsible disclosure for the sake of our users, so please reach out before posting in a public space.**
+For information on reporting security vulnerabilities in Jitsi Meet, see [SECURITY.md](./SECURITY.md).
 
 ## Acknowledgements
 

.github/ISSUE_TEMPLATE/4-security-issues.md → SECURITY.md

@@ -1,11 +1,9 @@
----
-name: Security issues
-about: Please email [email protected]
+# Security
 
----
+## Reporting security issuess
 
 We take security very seriously and develop all Jitsi projects to be secure and safe.
 
 If you find (or simply suspect) a security issue in any of the Jitsi projects, please send us an email to [email protected].
 
-We encourage responsible disclosure for the sake of our users, so please reach out before posting in a public space.
+**We encourage responsible disclosure for the sake of our users, so please reach out before posting in a public space.**