web-ui: Add utils file

Utils file has a function to get the number of rows to load depending on screen height

web-ui/src/app/utils.ts

@@ -0,0 +1,6 @@
+export function getNumberOfRowsForScreen(height: number): number {
+    if (height < 550) {
+        return 10;
+    }
+    return Math.min(10 + Math.ceil((height - 550) / 20), 100);
+}