add endpoint for general stats

load build data to graph
redesign top info tiles
place add button on header
folder restructure

frontend/lib/constants/color_constants.dart

@@ -0,0 +1,22 @@
+import 'package:flutter/material.dart';
+
+const primaryColor = Color(0xFF2697FF);
+//const secondaryColor = Color(0xFF2A2D3E);
+//const bgColor = Color(0xFF212132);
+
+const secondaryColor = Color(0xFF292929);
+const bgColor = Color(0xFF212121);
+const darkgreenColor = Color(0xff0a7005);
+const greenColor = Color(0xFF6bab58);
+
+const defaultPadding = 16.0;
+const double defaultBorderRadius = 15;
+
+class ColorConstants {
+  static Color blue = Color(0xFF0D46BB);
+}
+
+class Palette {
+  static const Color background = Color(0xFFEDEEF2);
+  static const Color wrapperBg = Color(0xFF212121);
+}