docs: ✏️ fix issue template bug

rename config.yaml to config.yml

Author: duyifanict

.github/ISSUE_TEMPLATE/config.yaml renamed to .github/ISSUE_TEMPLATE/config.yml

@@ -2,4 +2,4 @@ blank_issues_enabled: false
 contact_links:
   - name: "\U0001F4DA BaiscTS user documentation"
     url: https://github.com/GestaltCogTeam/BasicTS/blob/master/tutorial/getting_started.md
-    about: Documentation for users of BaiscTS
+    about: Documentation for users of BaiscTS