Issue template: update with website

Also take the chance to update the text to match the website.

Signed-off-by: Miguel Ojeda <[email protected]>

Author: ojeda

.github/ISSUE_TEMPLATE/config.yml

@@ -2,9 +2,9 @@ blank_issues_enabled: true
 
 contact_links:
   - name: Questions, help, feedback, etc.
-    url: https://github.com/Rust-for-Linux/linux/blob/rust/README.md
-    about: Please use the mailing list or the Zulip chat.
+    url: https://rust-for-linux.com/contact#zulip-chat
+    about: Please use the Zulip chat.
 
-  - name: Security vulnerability
-    url: https://www.kernel.org/doc/html/latest/admin-guide/security-bugs.html
-    about: If the code is already in mainline, read this link.
+  - name: Report a security bug
+    url: https://docs.kernel.org/admin-guide/security-bugs.html
+    about: Please read the "Security bugs" page in the kernel documentation.