News blog with featured posts grid: Replace footer

[carolinan]

Description

This PR closes #404 and replaces #572

It replaces the footer with the newsletter-signup with the footer with the columns in the pattern
"News blog with featured posts grid".

In order to add the footer with the columns, a new footer template part was created, to make it easier for users to use the same footer across the site, if they want.

Screenshots
After:

Testing Instructions

Go to Appearance > Editor > Templates.
Select the blog home template.
In the Template tab, open the Design panel.
Select the design "News blog with featured posts grid".
Preview the footer.
Confirm that the newsletter-signup pattern shows above the footer with the columns (two columns with lists of links).

[github-actions]

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Co-authored-by: carolinan <[email protected]>
Co-authored-by: juanfra <[email protected]>
Co-authored-by: alaminfirdows <[email protected]>
Co-authored-by: beafialho <[email protected]>

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[github-actions]

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[juanfra]

Thank you, works well!

Screen.Recording.2024-10-15.at.10.54.16.mov