Easier Management of Static Assets

### Description

When building out Dashboards, it is often a requirement to have images, videos, or other static assets for your site. We could provide an optimised UX here that allows users to upload, manage and host static assets in Node-RED.

E.g. a basic folder/file management UX from the Node-RED sidebar? There could be benefit of this being a core Node-RED feature, but I see clear benefits of this for Dashboard-specifically.

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate