Remove get_default_response in favor of a static Response method.

We want to build different kind of response depending of the context.

src/server/response.cpp

@@ -3,6 +3,7 @@
 
 #include "response.h"
 #include "request_context.h"
+#include "internalServer.h"
 #include "kiwixlib-resources.h"
 
 #include "tools/regexTools.h"
@@ -56,6 +57,16 @@ Response::Response(const std::string& root, bool verbose, bool withTaskbar, bool
 {
 }
 
+std::unique_ptr<Response> Response::build(const InternalServer& server)
+{
+  return std::unique_ptr<Response>(new Response(
+        server.m_root,
+        server.m_verbose.load(),
+        server.m_withTaskbar,
+        server.m_withLibraryButton,
+        server.m_blockExternalLinks));
+}
+
 
 static MHD_Result print_key_value (void *cls, enum MHD_ValueKind kind,
                                    const char *key, const char *value)