A11y: Spec pages have two h1 tags

[microbit-mark]

Description

A clear and concise description of what the issue is

Web pages should only have 1 h1 tag for screenreader accessibility

Adding the specs as submodules means that they have a header in the README and a header in the frontmatter

We could update the front matter to remove the title, but it makes the pages inconsistent with the rest of the site.

Expected behaviour

We should only have one h1 heading per page

Screenshots

If applicable, add screenshots to help explain the issue

[StarTrooper08]

Can I work on this issue if it's still unresolved. I m new to Microbit community.