Version 5.1.0

• New crown graphic in the header 👑 #503
• Remove aria-labelledby from accordion sections #503
• Add (link opens in new tab) suffix to links where new_tab: true. This text can be overridden by using the default_link_new_tab_text configuration option, or disabled by setting it to nil. This could be breaking if you've already added text to new_tab: true links manually, check your links to ensure there's no repetition #497
• Add custom brand support to the task list component, thanks @misaka #496
• Various improvements to style and examples in the guide, thanks @paulrobertlloyd and @frankieroberto #504, #506