[Website] Re-add Nitro download page

[tobias-tengler]

No description provided.

[Copilot]

Pull request overview

Reintroduces a dedicated Nitro download experience on the website’s Nitro product page (including native app download options), and adjusts header/drawer stacking to ensure overlays render above the sticky header.

Changes:

• Raised z-index values for the sticky header and mobile drawers to improve overlay stacking.
• Updated the Nitro product page CTA area to use a new NitroDownload widget instead of the “Launch Web App” button, and added a product screenshot.
• Added a client-side NitroDownload component that fetches release manifests from the CDN and renders stable/insider download options.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
website-next/src/components/TocDrawer.tsx	Increase overlay z-index to ensure TOC drawer sits above other sticky elements.
website-next/src/components/SidebarDrawer.tsx	Increase overlay z-index to ensure sidebar drawer sits above other sticky elements.
website-next/src/components/Header.tsx	Increase header z-index to align stacking behavior with other overlays.
website-next/app/(content)/products/nitro/page.tsx	Swap primary CTA to NitroDownload and add Nitro screenshot image.
website-next/app/(content)/products/nitro/NitroDownload.tsx	New download widget: fetch manifests, pick OS-specific stable download, and provide full download matrix.

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