[libadwaita/wip/exalm/migration-icons] doc: Remove the icon bundling section from migration guide

[Alexander Mikhaylenko <alexm src gnome org>]

commit 0844922b058a5f7f2f2d5d888743b72d751719f4
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Wed Sep 22 16:45:52 2021 +0500

    doc: Remove the icon bundling section from migration guide
    
    That hasn't happened, so let's not confuse people.

 doc/migrating-libhandy-1-4-to-libadwaita.md | 7 -------
 1 file changed, 7 deletions(-)
---
diff --git a/doc/migrating-libhandy-1-4-to-libadwaita.md b/doc/migrating-libhandy-1-4-to-libadwaita.md
index fa3ecb1d..09c4fcba 100644
--- a/doc/migrating-libhandy-1-4-to-libadwaita.md
+++ b/doc/migrating-libhandy-1-4-to-libadwaita.md
@@ -62,13 +62,6 @@ Libadwaita:
 
 Applications should not use them.
 
-### Bundle the Icons You're Using
-
-The preferred way to use icons in applications is to copy them into the
-application and to bundle them via [struct@Gio.Resource].
-Referencing system icons won't work in Libadwaita other than for icons GTK
-itself ships, so make sure to bundle the icons.
-
 ### Use `HdyFlap` Properties for Adding Children Instead of `gtk_container_add()`
 
 `HdyFlap` provides the "content", "flap" and "separator" properties that can be