添加giscus设置选项

根据giscus官方文档，添加了data-strict和data-input-position设置选项

layouts/partials/comments/provider/giscus.html

@@ -6,8 +6,10 @@
     data-category="{{- .category -}}"
     data-category-id="{{- .categoryID -}}"
     data-mapping="{{- default `title` .mapping -}}"
+    data-strict="{{- default 0 .strict -}}"
     data-reactions-enabled="{{- default 1 .reactionsEnabled -}}"
     data-emit-metadata="{{- default 0 .emitMetadata -}}"
+    data-input-position="{{- default `top` .inputPosition -}}"
     data-theme="{{- default `light` .lightTheme -}}"
     data-lang="{{- default `en` .lang -}}"
     crossorigin="anonymous"