feat: update grid and typography

[thomasguillot]

All Submissions:

• Have you followed the Newspack Contributing guideline?
• Does your code follow the WordPress' coding standards and VIP Go coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Introduces a new grid, typography, and spacing. We also have a custom class that can be added to the Columns Block newspack-grid, allowing us to perfectly control the layout when using 3 columns.

Note: This is a first pass

How to test the changes in this Pull Request:

1. Create homepage with bunch of block (especially columns)
2. Switch to this branch
3. Refresh homepage

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

[laurelfulford]

This looks good to me, @thomasguillot! I see the subtle changes, but I don't see any issues with them.

The only thing may be worth keeping an eye on is the use of the tertiary colour in the theme.json settings, since all of those elements can now be changed if that colour is changed in the Style settings. So far that's only an issue in my head so it might be fine -- and there are legitimate reasons to change those colours, too 🙂

Anyway - long way to say

[thomasguillot]

The only thing may be worth keeping an eye on is the use of the tertiary colour in the theme.json settings, since all of those elements can now be changed if that colour is changed in the Style settings.

I think users should be able to change they different greys so I'm not to worried. Next, I was going to experiment with a new style.

[matticbot]

🎉 This PR is included in version 1.5.0-alpha.1 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀

[matticbot]

🎉 This PR is included in version 1.5.0 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀