refactor: Simplify environment config selection

Author: fulleni

lib/main.dart

@@ -4,17 +4,13 @@ import 'package:ht_main/bootstrap.dart';
 // Define the current application environment here.
 // Change this value to switch between environments for local development.
 const app_config.AppEnvironment currentEnvironment =
-    app_config
-        .AppEnvironment
-        .developmentInMemory; // Or .developmentApi, or .production
+    app_config.AppEnvironment.development; // production/development/demo
 
 void main() async {
   final appConfig = switch (currentEnvironment) {
     app_config.AppEnvironment.production => app_config.AppConfig.production(),
-    app_config.AppEnvironment.developmentInMemory =>
-      app_config.AppConfig.developmentInMemory(),
-    app_config.AppEnvironment.developmentApi =>
-      app_config.AppConfig.developmentApi(),
+    app_config.AppEnvironment.demo => app_config.AppConfig.demo(),
+    app_config.AppEnvironment.development => app_config.AppConfig.development(),
   };
   await bootstrap(appConfig);
 }

pubspec.lock

@@ -335,6 +335,15 @@ packages:
       url: "https://github.com/headlines-toolkit/ht-auth-client.git"
     source: git
     version: "0.0.0"
+  ht_auth_inmemory:
+    dependency: "direct main"
+    description:
+      path: "."
+      ref: HEAD
+      resolved-ref: "7276ba82bfb24550c0e19d00a1c702b55ebc10ee"
+      url: "https://github.com/headlines-toolkit/ht-auth-inmemory"
+    source: git
+    version: "0.0.0"
   ht_auth_repository:
     dependency: "direct main"
     description: