chore(build): update github issue config

.github/ISSUE_TEMPLATE/config.yml

@@ -1,10 +1,10 @@
 blank_issues_enabled: false
 contact_links:
-  - name: Gitter
-    url: https://gitter.im/hexo-theme-icarus/community
-    about: Redirect your Icarus usage questions to Gitter.
-  - name: Gitter
-    url: https://gitter.im/hexo-theme-icarus/community
+  - name: GitHub Discussions
+    url: https://github.com/ppoffice/hexo-theme-icarus/discussions
+    about: Redirect your Icarus usage questions to here.
+  - name: GitHub讨论组
+    url: https://github.com/ppoffice/hexo-theme-icarus/discussions
     about: 与Icarus使用相关的问题请转至这里。
   - name: Bug Report
     url: https://github.com/ppoffice/hexo-theme-icarus/issues/new?template=bug_report.md
@@ -17,4 +17,4 @@ contact_links:
     about: Please follow this template if you are requesting a new feature, or your issue may be closed without further notice.
   - name: 功能建议
     url: https://github.com/ppoffice/hexo-theme-icarus/issues/new?template=功能建议.md
-    about: 请按照模板填写功能建议，否则你的Issue可能会被直接关闭。
+    about: 请按照模板填写功能建议，否则你的Issue可能会被直接关闭。