Readme Plugin: Allow the readme card render emojis in Backstage

[renatafaracobah]

Describe the feature

Since the readme card is a tool to provide information to users from the repository readme file, it would be nice that it couldrender emojis in the same way GitHub does.

Added value

We would improve readability and be consistent with source experience.

Additional context

Using packages:
@axis-backstage/plugin-readme@^0.9.0
@axis-backstage/plugin-readme-backend@^0.8.0

[fridajac]

Hi @renatafaracobah! That would be really great, of course the README plugin should render emojis 👍 Do you have the possibility to contribute with this feature?