Put back some redirects that external sites are using

disks/pcx86/games/infocom/zork1/machine.md

@@ -2,6 +2,8 @@
 layout: page
 title: "IBM PC (Model 5150) running Zork I"
 permalink: /disks/pcx86/games/infocom/zork1/
+redirect_from:
+  - /disks/pc/games/infocom/zork1/
 machines:
   - type: pcx86
     id: ibm5150-zork1

disks/pcx86/tools/microsoft/masm/1.00/README.md

@@ -2,6 +2,8 @@
 layout: page
 title: Microsoft Macro Assembler 1.00
 permalink: /disks/pcx86/tools/microsoft/masm/1.00/
+redirect_from:
+  - /disks/pc/tools/microsoft/masm/1.00/
 ---
 
 Microsoft Macro Assembler 1.00

disks/pcx86/windows/1.01/README.md

@@ -6,6 +6,7 @@ redirect_from:
   - /configs/pc/machines/5160/ega/640kb/win101/
   - /devices/pc/machine/5160/ega/640kb/win101/
   - /devices/pc/machine/5160/ega/640kb/win101/debugger/
+  - /disks/pc/windows/1.01/
 machines:
   - type: pcx86
     id: ibm5160

disks/pcx86/windows/3.10/README.md

@@ -2,6 +2,8 @@
 layout: page
 title: Microsoft Windows 3.10
 permalink: /disks/pcx86/windows/3.10/
+redirect_from:
+  - /disks/pc/windows/3.10/
 machines:
   - type: pcx86
     id: ibm5170-win310