Update README to include newer features, expand on PKI, separate PKI endpoints into separate section in API reference

docs/mint.json

@@ -1,6 +1,6 @@
 {
   "name": "Infisical",
-  "openapi": "https://app.infisical.com/api/docs/json",
+  "openapi": "http://localhost:8080/api/docs/json",
   "logo": {
     "dark": "/logo/dark.svg",
     "light": "/logo/light.svg",
@@ -696,7 +696,12 @@
         {
           "group": "Audit Logs",
           "pages": ["api-reference/endpoints/audit-logs/export-audit-log"]
-        },
+        }
+      ]
+    },
+    {
+      "group": "Infisical PKI",
+      "pages": [
         {
           "group": "Certificate Authorities",
           "pages": [