[ORNIS-12] task: fix CORS

[LaurineDaSilva]

ORNIS-12

For now the link between the back and the front is made with a @CORSMapping annotation in the bird controller.

Instead,

1. Create a Configuration package
2. Create a WebConfig Class (Config: name by convention but you can named WebConfiguration) and implement WebMvcConfigurer
3. Create a addCorsMappings() method and add a @Configuration annotation
4. Delete @CrossMapping in Controller files

• methods = 5 verbs Rest
• patterns = /**
• origin(s)

Baeldung spring cors

Ornis's wiki reference