Add Azure detection

- Add Azure specifically, some headers are exposed
- Add Azure CDN (by Verizon) that has specific headers from their documentation.

https://docs.microsoft.com/en-us/azure/cdn/cdn-verizon-http-headers

src/apps.json

@@ -115,6 +115,30 @@
       "icon": "Accelerated-Mobile-Pages.svg",
       "website": "https://www.ampproject.org"
     },
+    "Azure": {
+      "cats": [
+        22
+      ],
+      "headers": {
+        "azure-regionname": "",
+        "azure-sitename": "",
+        "azure-slotname": "",
+        "azure-version": ""
+      },
+      "icon": "azure.svg",
+      "website": "https://azure.microsoft.com"
+    },
+    "Azure CDN": {
+      "cats": [
+        31
+      ],
+      "headers": {
+        "server": "(?:ECAcc|ECS|ECD)",
+        "X-EC-Debug": ""
+      },
+      "icon": "azure.svg",
+      "website": "https://azure.microsoft.com/en-us/services/cdn/"
+    },
     "Acquia Cloud": {
       "cats": [
         22

src/icons/azure.svg

@@ -0,0 +1 @@
+<svg height="1995" viewBox="0 0 161.67 129" width="2500" xmlns="http://www.w3.org/2000/svg"><path d="m88.33 0-47.66 41.33-40.67 73h36.67zm6.34 9.67-20.34 57.33 39 49-75.66 13h124z" fill="#0072c6"/></svg>