Add @t3-oss/env-core, envalid, varlock to Configuration Management (#68)

Author: bakasmarius

src/categories/configuration-management.json

@@ -1,5 +1,15 @@
 {
   "name": "Configuration Management",
   "description": "Load environment variables and configure your applications",
-  "packages": ["config", "convict", "dotenv", "env-schema", "nconf", "rc"]
+  "packages": [
+    "@t3-oss/env-core",
+    "config",
+    "convict",
+    "dotenv",
+    "env-schema",
+    "envalid",
+    "nconf",
+    "rc",
+    "varlock"
+  ]
 }