Add new brand colour for DSIT

[beccapearce]

No description provided.

[querkmachine]

Good morning! Thanks for the contribution!

Unfortunately, you've caught us right at the start of a code freeze, as we're preparing to release a new version of GOV.UK Frontend. As such, this PR is unlikely to be merged and released for quite a while as part of our substantial v5 release.

We're also currently reviewing what organisation colours we ship and the process by which we update them. That work is also likely to go out in v5.

I've seen that you've opened a similar change in GOV.UK Publishing Components too. Hopefully that will work for your needs in the meantime.

[colinrotherham]

I've rebased this PR with main to resolve src → packages/govuk-frontend/src conflicts

//cc @querkmachine

[querkmachine]

Note: You can follow on with the aforementioned organisation colour refresh work here.

• Update organisation colours #3407

[querkmachine]

Hi there! Sorry for the long wait on this one.

We've decided we would prefer to batch organisation colour changes into our larger organisation colour update in #3407. In that PR, we're using the colours that (to the best of our knowledge) have been ascribed to each department by Design102 to try and enforce consistency, rather than having individual departments raise their own PRs.

As such, I'm going to close this PR for now, as it will be largely superceded by this other work. Thank you!