Follow-up on "UI Polish for Self-hosted models" Beta badge component

The following discussion from !168961 (merged) should be addressed:

• @ohoral started a discussion: (+1 comment)

  Using a div inside an h1 is not allowed by the HTML specification. Instead, you can replace it with a span to achieve the same effect while adhering to the spec. However, there's another div inside the beta-badge component that remains. I believe fixing that would require a refactoring of that component itself, which might be out of scope for now but a good follow-up candidate.