[DEV-12518] Feature - Make "expanded" media gallery 1120px wide

[kudlajz]

Contained keeps the current width of 720px and expanded becomes 1120px, which is the width of the newsroom's container (minus paddings).

I've also changed the margins of the page itself, so the title is the same position as other pages (albeit offseted).

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
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| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **theme-nextjs-bea-cookbook** | ⬜️ Ignored ([Inspect](https://vercel.com/prezly/theme-nextjs-bea-cookbook/DBZcjpUbxmVGL5QRgTP3fPGiMM2G)) | [Visit Preview](https://theme-nextjs-bea-cookbook-git-feature-dev-12518-8f9359-prezly1.vercel.app) | | Feb 19, 2024 4:53pm | | **theme-nextjs-bea-photography** | ⬜️ Ignored ([Inspect](https://vercel.com/prezly/theme-nextjs-bea-photography/HjvwSRapsqA3sVC9SYtn28zW4wwE)) | [Visit Preview](https://theme-nextjs-bea-photography-git-feature-dev-125-a28bc6-prezly1.vercel.app) | | Feb 19, 2024 4:53pm | | **theme-nextjs-bea-the-good-newsroom** | ⬜️ Ignored ([Inspect](https://vercel.com/prezly/theme-nextjs-bea-the-good-newsroom/iaUpo4apN2FdoNMGZEs118F2gdUZ)) | [Visit Preview](https://theme-nextjs-bea-the-good-newsroom-git-feature-d-dcb5eb-prezly1.vercel.app) | | Feb 19, 2024 4:53pm |