Use image scr instead of static image for marketing banners

[Zdravko Kolev]

We have implemented loading of banners already, although these are static images, and doing alternations on it is hard. Having another approach with cdn links is going to be better.

Example would be

<img src="https://static.infragistics.com/marketing/Website/whitepapers/angular-ref-card/angular-essentials-header-1100x703.jpg" loading="lazy">