Marketplace Thank You: Centralize footer

[WBerredo]

Proposed Changes

Remove lateral padding and update width to make the footer items to be centralized

Testing Instructions

• Install a plugin or a theme (or both)
• On the Marketplace Thank You page check if the footer items are centralized

Before	After

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
• For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-ajp-p2)?

[matticbot]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-65287

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-65287&env=jetpack

[matticbot]

This PR does not affect the size of JS and CSS bundles shipped to the user's browser.

Generated by performance advisor bot at iscalypsofastyet.com.

[cpapazoglou]

LGTM

[epeicher]

LGTM! 🚀

Below are two screenshots taken using Firefox that add some lines when selecting elements in the HTML. I have also added two identical red squares to compare