refactor: rename project from Flights to Missions and update related components

This commit transitions the project from Azaion.Flights to Azaion.Missions, updating namespaces, DTOs, services, and database entities accordingly. The Docker configuration and entry points have been modified to reflect the new project structure. Additionally, the README and documentation have been updated to clarify the ongoing renaming process and its implications. All references to flights have been replaced with missions, ensuring consistency across the codebase.

Middleware/ErrorHandlingMiddleware.cs

@@ -1,7 +1,7 @@
 using System.Net;
 using System.Text.Json;
 
-namespace Azaion.Flights.Middleware;
+namespace Azaion.Missions.Middleware;
 
 public class ErrorHandlingMiddleware(RequestDelegate next, ILogger<ErrorHandlingMiddleware> logger)
 {