[SSL/TLS] Add Client Certificates availability by plans (#17227)

PCX-12573

Author: kyouheicf

src/content/plans/index.json

@@ -2730,6 +2730,34 @@
 					"ent": "Yes"
 				}
 			}
+    },
+    "client_certificates": {
+      "title": "Client Certificates",
+      "link": "/ssl/client-certificates/",
+      "properties": {
+        "availability": {
+          "title": "Availability",
+          "summary": "Available on all plans.",
+          "free": "Yes",
+          "pro": "Yes",
+          "biz": "Yes",
+          "ent": "Yes"
+        },
+        "quantity": {
+          "title": "Client Certificates included, issued by a Cloudflare Managed CA",
+          "free": 100,
+          "pro": 100,
+          "biz": 100,
+          "ent": "100 (default), but can allocate more quota."
+        },
+        "byo_ca": {
+          "title": "[Bring your own CA](/ssl/client-certificates/byo-ca/)",
+          "free": "No",
+          "pro": "No",
+          "biz": "No",
+          "ent": "Yes"
+        }
+      }
 		}
 	},
 	"support": {