feat: Update security level names and descriptions in template files

src/common/core/templates/templates/high.json

@@ -1 +1,3 @@
-{} // TODO
+{
+  "name": "Advanced security level with focus on robust security measures and comprehensive protection"
+}

src/common/core/templates/templates/low.json

@@ -1,5 +1,5 @@
 {
-  "name": "Basic security level",
+  "name": "Basic security level that provides essential settings for web application protection",
   "settings": {
     "SERVER_NAME": "www.example.com",
     "USE_REVERSE_PROXY": "yes",

src/common/core/templates/templates/medium.json

@@ -1 +1,3 @@
-{} // TODO
+{
+  "name": "Balanced security level that offers a mix of security features and performance optimizations"
+}