docs: add docs for Proto package manager

[ImBIOS]

Description

This commit adds support for the Proto package manager in the site/types/release.ts, site/util/downloadUtils.ts, components/Downloads/Release/PlatformDropdown.tsx, and components/Icons/Platform/Proto.tsx files. The Proto package manager is now included as an option in the PackageManager enum and the platformItems array. The PlatformDropdown component has been updated to display the Proto icon. Additionally, the en.json file has been updated to include instructions for installing Proto.

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Check List

• [x] I have read the Contributing Guidelines and made commit messages that follow the guideline.
• [x] I have run npm run format to ensure the code follows the style guide.
• [x] I have run npm run test to check if all tests are passing.
• [x] I have run npx turbo build to check if the website builds without errors.
• [x] I've covered new added functionality with unit tests if necessary.

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Name	Status	Preview	Updated (UTC)
nodejs-org	✅ Ready (Inspect)	Visit Preview	Aug 4, 2024 5:39am

[bmuenzenmeyer]

https://github.com/nodejs/nodejs.org/issues/7037 will supersede this

[avivkeller]

Also, there hasn't been any activity from the author in a little bit. If there's no activity in the next week (~4 months since open), I'm going to assume this stale-d and close it.