Partial functionality for the "Visit our communities" button

[trichoplax]

Describe the bug
The large yellow button that says "Visit our communities" is functionally a link to https://codidact.com/ but it uses a button element rather than an anchor element (<a> tag). This means that it lacks some of the functionality of a link:

• Hovering over the button or its text does not show the destination URL, for browsers that usually show this information for a link. This prevents a user from checking where they will be taken before they click.
• Right clicking does not give the usual browser options for a link. None of the following are available:
  • Open link in new tab / new window / new private window
  • Save link
  • Copy link
  • Bookmark link
• Middle clicking does not open the page in a new tab, forcing a user to leave the landing page if they click, even if they prefer not to.
• Clicking on the button will do nothing if JavaScript is disabled, whereas a link would work without the need for JavaScript.
• The button will give misleading information to users of assistive technology such as screen readers.

Expected behavior
A link should be an anchor element (<a> tag) so that the browser can automatically avoid the problems described above.

Visually, the link can remain identical. This is not a request to change the style, but to fix the missing functionality.