Add new icons for file, organization, signature, task, and flow functionalities

- Introduced DD_fileFLOW_ICON.ico to represent file flow.
- Added DD_orgFLOW_ICON.ico for organizational flow representation.
- Included DD_signFLOW_ICON.ico for signature flow functionality.
- Implemented DD_taskFLOW_ICON.ico to depict task flow.
- All icons are in ICO format and located in the dd-icons directory.

src/client/dd-hub-react/src/layouts/nav-config-dashboard.tsx

@@ -4,6 +4,7 @@ import { SvgColor } from 'src/components/svg-color';
 // Navbar Icons
 
 const icon = (name: string) => <SvgColor src={`/assets/icons/navbar/${name}.svg`} />;
+const iconDD = (name: string) => <img src={`/assets/icons/dd-icons/${name}.ico`} alt="" style={{ width: 24, height: 24 }} />;
 
 export type NavItem = {
   title: string;
@@ -21,12 +22,12 @@ export const navData = [
   {
     title: 'EasyFlow',
     path: '/doc-search',
-    icon: icon('ic-doc-search'),
+    icon: iconDD('DD_easyFLOW_ICON'),
   },
   {
     title: 'TaskFlow',
     path: '/blog',
-    icon: icon('ic-blog'),
+    icon: iconDD('DD_taskFLOW_ICON'),
     info: (
       <Label color="error" variant="inverted">
         +3
@@ -36,12 +37,12 @@ export const navData = [
   {
     title: 'OrgFlow',
     path: '/products',
-    icon: icon('ic-cart'),
+    icon: iconDD('DD_orgFLOW_ICON'),
   },
   {
     title: 'SignFlow',
     path: '/user',
-    icon: icon('ic-user'),
+    icon: iconDD('DD_signFLOW_ICON'),
   },
   {
     title: 'ChartFlow',