Allow removal of Content Licence information in the GOV.UK footer component

[ch-ncolley]

I have coded this up but I understand there may be a reason why this proposal is not accepted or wanted so no hard feelings if it is not accepted 😄

At Companies House (https://find-and-update.company-information.service.gov.uk/) we do not use the OGL Licence:

The Companies House public register is not covered by the OGL. This information is made public under the Companies Act 2006

If we want to use the govukFooter Nunjucks macro we have to manually hide the OGL Licence by doing something like:

.ch-footer {
    .govuk-footer__licence-logo,
    .govuk-footer__licence-description {
        display: none;
    }
    .govuk-footer__meta-custom {
        margin-bottom: 0;
    }
}

or by maintaining our own Nunjucks macro, where we then dont benefit from any markup changes for example when the crown logo was added recently.

This pull request introduces:

• a way to set contentLicence to false which then hides it.
• additional CSS to remove the space below any meta links or custom meta information if there's no content licence information.
• fixtures to visually check the above and to test the hiding behaviour
• updates to the documentation to make note this parameter now accepts a boolean false value

Screenshots

Companies House example

{{ govukFooter({
  meta: {
    items: [
      {
        href: "http://resources.companieshouse.gov.uk/serviceInformation.shtml",
        text: "Policies"
      },
      {
        href: "/help/cookies",
        text: "Cookies"
      },
      {
        href: "https://www.gov.uk/government/organisations/companies-house#org-contacts",
        text: "Contact us",
        attributes: {
          target: "_blank"
        }
      },
      {
        href: "/help/accessibility-statement",
        text: "Accessibility statement"
      },
      {
        href: "https://developer.companieshouse.gov.uk/api/docs/",
        text: "Developers"
      }
    ],
    html: 'Built by <a class="govuk-footer__link" href="https://www.gov.uk/government/organisations/companies-house">Companies House</a>'
  },
  contentLicence: false
}) }}

GOV.UK Design System guidance

Before	After

[romaricpascal]

Thanks for proposing this @NickColley. The technical changes look good and the review app seemed OK to me 🙌🏻

@hazalarpalikli @mia-allers-gds @CharlotteDowns any chance one of you could have a look at the Footer page of the preview app to confirm things look OK design-wise for the examples without licence, please?

[romaricpascal]

Oh, we'll need a CHANGELOG entry for this new feature as well. Are you find drafting it @NickColley or would you prefer we add it before merging?

[NickColley]

@romaricpascal I'll make sure to add the CHANGELOG entry good spot 👍🏻

[ch-ncolley]

@romaricpascal added first draft of the CHANGELOG entry and commited your suggestion ready for final review.