✨ relative_path filter

_plugins/relative_path.rb

@@ -0,0 +1,10 @@
+module Jekyll
+  module RelativePath
+    def relative_path(url)
+      page_url = @context.registers[:page]['url']
+      Pathname(url).relative_path_from(Pathname(page_url)).to_s
+    end
+  end
+end
+
+Liquid::Template.register_filter(Jekyll::RelativePath)