refactorisation de la configuration

appsettings.json

@@ -2,18 +2,18 @@
   "RootApiKeySecret": "<your-root-api-clear-key>",
   "NuGet": {
     "ExternalUrl" : "<http://your-external.url",
-    "SourceDir" : "<your-Source-dir>"
+    "PackagesRootDir" : "<your-Source-dir>",
+    "ProtectionTitle": "protected-data-v1"
   },
   "ConnectionStrings": {
     "DefaultConnection": "Server=<pqserver>;Port=<pqport>;Database=<dbname>;Username=<dbusername>;Password=<dbpass>;"
   },
   "AllowedHosts": "*",
-  "SmtpSettings": {
-    "Server": "localhost",
+  "Smtp": {
+    "Server": "<smtp.server.address>",
     "Port": 25,
-    "SenderName": "Paul Schneider",
-    "SenderEmail": "paul@pschneider.fr",
-    "ProtectionTitle": "protected-data-v1"
+    "SenderName": "<from-name>",
+    "SenderEmail": "<from-email>"
   },
   "Logging": {
     "LogLevel": {