Update azure.github.io links to sonic-net.github.io (#12209)

Why I did it
azure.github.io/SONiC/ no longer works and returns 404 Not Found. Updated it to the correct sonic-net.github.io/SONiC/

files/image_config/environment/motd

@@ -10,5 +10,5 @@ You are on
 Unauthorized access and/or use are prohibited.
 All access and/or use are subject to monitoring.
 
-Help:    http://azure.github.io/SONiC/
+Help:    https://sonic-net.github.io/SONiC/
 

platform/vs/sonic-gns3a.sh

@@ -41,9 +41,9 @@ echo "
     \"category\": \"router\",
     \"description\": \"SONiC Virtual Switch/Router\",
     \"vendor_name\": \"SONiC\",
-    \"vendor_url\": \"https://azure.github.io/SONiC/\",
+    \"vendor_url\": \"https://sonic-net.github.io/SONiC/\",
     \"product_name\": \"SONiC\",
-    \"product_url\": \"https://azure.github.io/SONiC/\",
+    \"product_url\": \"https://sonic-net.github.io/SONiC/\",
     \"registry_version\": 3,
     \"status\": \"experimental\",
     \"maintainer\": \"SONiC\",

src/sonic-device-data/README.md

@@ -1,4 +1,4 @@
 # sonic-device-data
 Device-specific data for the SONiC project
 
-See the [SONiC Website](http://azure.github.io/SONiC/) for more information about the SONiC project.
+See the [SONiC Website](https://sonic-net.github.io/SONiC/) for more information about the SONiC project.

src/sonic-host-services-data/README.md

@@ -16,4 +16,4 @@ dpkg-buildpackage -rfakeroot -Tclean
 
 ---
 
-See the [SONiC Website](http://azure.github.io/SONiC/) for more information about the SONiC project.
+See the [SONiC Website](https://sonic-net.github.io/SONiC/) for more information about the SONiC project.