fix(Accordion): panel title layout

[kuzhelov]

TODO

• add docs example
• add changelog entry

---

This PR removes empty line rendered for Accordion panel's title whenever custom block element was introduced:

const panels = [
  {
    title: { content: <div>What is a point?</div> },
    content: ...
  },
  ...
]

export default () => <Accordion panels={panels} />

Was

Now

[mnajdova]

Maybe is worth adding example so the screens will catch this?

[kuzhelov]

yes, was thinking about the same thing, was waiting for the same opinions on that :) will add, thank you!