Remove all code references to Kilt

src/kemal/helpers/macros.cr

@@ -1,5 +1,3 @@
-require "kilt"
-
 CONTENT_FOR_BLOCKS = Hash(String, Tuple(String, Proc(String))).new
 
 # `content_for` is a set of helpers that allows you to capture
@@ -37,9 +35,9 @@ CONTENT_FOR_BLOCKS = Hash(String, Tuple(String, Proc(String))).new
 # setting the appropriate set of tags that should be added to the layout.
 macro content_for(key, file = __FILE__)
   %proc = ->() {
-    __kilt_io__ = IO::Memory.new
+    __view_io__ = IO::Memory.new
     {{ yield }}
-    __kilt_io__.to_s
+    __view_io__.to_s
   }
 
   CONTENT_FOR_BLOCKS[{{key}}] = Tuple.new {{file}}, %proc
@@ -60,17 +58,17 @@ end
 # ```
 # render "src/views/index.ecr", "src/views/layout.ecr"
 # ```
-@[Deprecated("Use `ECR#render` instead")]
 macro render(filename, layout)
   __content_filename__ = {{filename}}
-  content = render {{filename}}
-  render {{layout}}
+  io = IO::Memory.new
+  content = ECR.embed {{filename}}, io
+  ECR.embed {{layout}}, io
+  io.to_s
 end
 
 # Render view with the given filename.
-@[Deprecated("Use `ECR#render` instead")]
 macro render(filename)
-  Kilt.render({{filename}})
+  ECR.render({{filename}})
 end
 
 # Halt execution with the current context.