PR stan-dev#535 did not add folder pkgdown to .Rbuildignore, so this is done here

fweber144 · fweber144 · commit e6bae8b39452 · 2025-10-31T21:50:45.000+01:00
diff --git a/.Rbuildignore b/.Rbuildignore
@@ -14,3 +14,4 @@
 ^CRAN-SUBMISSION$
 ^docs$
 ^_pkgdown\.yml$
+^pkgdown$
