move files to src/ directory and add build/ to .gitignore

src/screens.c

@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: MIT */
+
+#include "globals.h"
+#include "home.h"
+#include "error.h"
+
+/* NOTE: this should be compile time */
+struct Screen screens[] = {
+    {
+        "home",
+        NULL,
+        draw_home
+    },
+    {
+        "error",
+        NULL,
+        draw_error
+    }
+};