Simplify argument forwarding when possible

IMHO it's now more obvious that these methods only forward their
arguments to other methods.

app/helpers/application_helper.rb

@@ -10,8 +10,8 @@ module ApplicationHelper
     %i[ar fa he].include?(locale)
   end
 
-  def markdown(text, **)
-    MarkdownConverter.new(text, **).render
+  def markdown(...)
+    MarkdownConverter.new(...).render
   end
 
   def wysiwyg(text)

app/helpers/link_list_helper.rb

@@ -1,5 +1,5 @@
 module LinkListHelper
-  def link_list(*, **)
-    render Shared::LinkListComponent.new(*, **)
+  def link_list(...)
+    render Shared::LinkListComponent.new(...)
   end
 end