feat: download button + determine OS automatically

[seanlodhammar]

Description

Adds a download button to the main header, that uses new getOS util function to detect the user's operating system. Works on both Firefox and Chromium browsers in my own testing.

Should note that getOS uses an experimental function navigator.userAgentData property to accurately detect the architecture that a user is running on. This is necessary for detecting whether a user is using a Silicon or Intel Mac CPU.

This property is only available on Chromium browsers at the moment, so if it is unavailable because the user is using a different browser (e.g. firefox), the navigator.userAgent string is parsed, and the function tries to get platform and architecture data from it. On Mac, even if the user is on the Silicon chip, it still shows up as "Intel" in the user agent string, so instead, this code checks the MacOS version the user is on, and if they're above version 13, then it downloads the Silicon version, otherwise it downloads the Intel version.

If on Linux, the download button sends the user to the Linux blog post.

Tested On

Windows

• Microsoft Edge
• Opera
• Firefox
• Google Chrome

  Linux

• Firefox
• Chromium

  MacOS

• Chromium
• Safari
• Firefox

Related Issue

273

Changes Made

• Download Button added to header
• getOS utility function added

Screenshots

Checklist

• [x] I have tagged the issue in this PR.
• [x] I have attached necessary screenshots.
• [x] I have provided a short description of the PR.
• [x] I ran yarn build and build is successful
• [x] My code follows the style guidelines of this project.
• [x] I have added necessary documentation (if applicable)

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