[about page] move CTA sponsors box into a sub component

frontend/src/app/components/about/about.module.ts

@@ -2,6 +2,7 @@ import { NgModule } from '@angular/core';
 import { CommonModule } from '@angular/common';
 import { Routes, RouterModule } from '@angular/router';
 import { AboutComponent } from './about.component';
+import { AboutSponsorsComponent } from './about-sponsors.component';
 import { SharedModule } from '../../shared/shared.module';
 
 const routes: Routes = [
@@ -13,7 +14,7 @@ const routes: Routes = [
 
 @NgModule({
   imports: [
-    RouterModule.forChild(routes)
+    RouterModule.forChild(routes),
   ],
   exports: [
     RouterModule
@@ -25,10 +26,14 @@ export class AboutRoutingModule { }
   imports: [
     CommonModule,
     AboutRoutingModule,
-    SharedModule,
+    SharedModule
   ],
   declarations: [
     AboutComponent,
+    AboutSponsorsComponent,
+  ],
+  exports: [
+    AboutSponsorsComponent,
   ]
 })
 export class AboutModule { }