Add paige.comments.utterances.theme config

README.md

@@ -277,6 +277,7 @@ site = ""
 
 [paige.comments.utterances] # See https://utteranc.es
 repo = ""
+theme = ""
 
 [paige.feed]
 disable = false # Exclude the page from feeds

layouts/partials/paige/comments/utterances.html

@@ -2,7 +2,7 @@
 
 {{ with $page.Param "paige.comments.utterances" }}
     <div class="mb-3" id="paige-comments">
-        <script async crossorigin="anonymous" issue-term="pathname" repo="{{ .repo }}" src="https://utteranc.es/client.js" theme="preferred-color-scheme"></script>
+        <script async crossorigin="anonymous" issue-term="pathname" repo="{{ .repo }}" src="https://utteranc.es/client.js" theme="{{ .theme }}"></script>
         <noscript>{{ i18n "paige_noscript" }}</noscript>
     </div>
 {{ end }}