Docs: Social cards don't remove HTML

[carlosperate]

In the docs, it looks like the twitter and OG social media metadata might keep any HTML tags used in the description. At least they are escaped, so maybe this is by design, but it might be worth removing the tag altogether.

For example in this page, the <strong> tags end up in the card:
https://makecode.microbit.org/online-learning

And in the HTML we see:

<meta name="twitter:description" content="&lt;strong&gt;Microsoft Teams&lt;/strong&gt; is a collaboration hub for Office 365 where Educators can organize student groups into classes with content, conversations, apps, and assignments all in one place." />

<meta property="og:description" content="&lt;strong&gt;Microsoft Teams&lt;/strong&gt; is a collaboration hub for Office 365 where Educators can organize student groups into classes with content, conversations, apps, and assignments all in one place." />

[ssande-fwd]

When I set up a local version of makecode, the same page, /online-learning, seems to take the description from pxtarget.json. I wonder why it's not doing the same for the production site.