[FEATURE_REQ] Add a thumbnail for the site / pages

[cernus76]

Area of the BTP Solution Diagrams that should be enhanced?

Starter Kit

Overview of feature request

Hi there!

I would like to recommend adding a thumbnail to your site for when you share it on social medias & on Teams.

Example in Teams:

This is an example from the Architecture Center in the docusaurus.config.ts:

    themeConfig: {
        image: 'img/ac-soc-med.png',
        metadata: [
            {
                name: 'keywords',
                content: 'sap, btp, architecture, center, hyperscaler, reference',
            },
        ],

Proposed solution

No response

Additional context

No response