Minicard component issues and features fixes

Minicard component has some css issues (errors and needs some features), adding text content as optional and also make the whole card as a link.

**No semi-colon here:**
https://github.com/adobe/aio-theme/blob/c293c01ac7340e498dacb6cb0716f8406638fb83/packages/gatsby-theme-aio/src/components/MiniResourceCard/index.js#L67

Results in the height not being set properly.

**Text content should be option-able. This check will fail and throw an error if no text content is present:**
https://github.com/adobe/aio-theme/blob/c293c01ac7340e498dacb6cb0716f8406638fb83/packages/gatsby-theme-aio/src/components/MiniResourceCard/index.js#L103C9-L103C9

The https://github.com/AdobeDocs/express-for-developers/ has a use-case of using the Minicard component without text body:
https://github.com/AdobeDocs/express-for-developers/blob/main/src/pages/index.md?plain=1#L80

**The whole card should act as a link. May need another variant to support this as only the image is clickable.**

Start with packages/gatsby-theme-aio/src/components/MiniResourceCard/index.js at the referenced lines, then compare the component usage in AdobeDocs/express-for-developers/src/pages/index.md. Done means the height styling works, text content is optional without an error, and the requested whole-card link behavior is supported.

Written by the indexing model from the issue text.