docs(web): enable pkgdown dark mode (#307)

eitsupi · web-flow · commit b5ae47c67a2b · 2024-09-16T19:15:12.000+09:00
diff --git a/_pkgdown.yml b/_pkgdown.yml
@@ -1,5 +1,6 @@
 url: https://prql.github.io/prqlc-r
 template:
   bootstrap: 5
+  light-switch: true
 development:
   mode: auto
