Add section for dropped feature "macros"

Author: odersky

docs/docs/reference/dropped/macros.md

@@ -0,0 +1,13 @@
+---
+layout: doc-page
+title: Dropped: Macros
+---
+
+The previous, experimental macro system has been dropped. Instead,
+there is a cleaner, more restricted system based on two complementary
+concepts: `inline` and `meta`.
+
+`inline` has been [implemented](../inline.md) in Dotty.
+
+`meta` is worked on in the separate [Scalameta](http://scalameta.org) project
+

docs/sidebar.yml

@@ -7,6 +7,8 @@ sidebar:
           subsection:
             - title: DelayedInit
               url: docs/reference/dropped/delayed-init.md
+            - title: Macros
+              url: docs/reference/dropped/macros.md
         - title: Implicit Function Types
           url: docs/reference/implicit-function-types.md
         - title: Intersection types