Card titles should avoid using h1, h2 or make it configurable

[Earu]

I've noticed that this component generates h1 and h2 html tags for its card titles & subtitles, this can lead to problems with robots not properly understanding the layout of a page later on.

I'm thinking of google robots that are notably responsible for the website SEO. Using a span tag with the same css styling as a fix should not be too much of an issue I think.