deconnexion button + nav bar fixed

src/app/services/token.service.ts

@@ -20,6 +20,17 @@ tokenKey = environment.tokenKey;
     }
   }
 
+    public eraseToken(): string | null {
+    const token = localStorage.getItem(this.tokenKey);
+    if(token) {
+        this.tokenKey = '';
+        return token;
+      }else {
+      return null;
+    }
+      }
+
+
   public getCurrentMembreId(): number | null {
     const token = this.getToken();
     if(token) {