Got rid of more app-specific demo machines (eg, DONKEY and WIN101); demos like that are more properly located in either the /apps or /disks folders (not /devices)

devices/pcx86/machine/5160/cga/256kb/debugger/machine.md

@@ -0,0 +1,14 @@
+---
+layout: page
+title: IBM PC XT (Model 5160, 256Kb, 10Mb Drive) with Color Display and Debugger
+permalink: /devices/pcx86/machine/5160/cga/256kb/debugger/
+redirect_from:
+  - /configs/pc/machines/5160/cga/256kb/demo/debugger/
+  - /devices/pcx86/machine/5160/cga/256kb/demo/debugger/
+machines:
+  - type: pcx86
+    id: ibm5160
+    debugger: true
+---
+
+{% include machine.html id="ibm5160" %}