docs: Add getting started>download page

[hannahiss]

Note: Please transform - [ ] into - (NA) in the description when things are not applicable

Related issues

#2900

Description

• Restore Download page from Boosted/Bootstrap doc.

• Change all URLs to CDN and package managers (beware, some are on the version number, some aren't):

  • jsDelivr: https://cdn.jsdelivr.net, direct link is https://cdn.jsdelivr.net/npm/@ouds/[email protected]
  • CDNjs: https://cdnjs.com/, not yet deployed, direct link to come
  • unpkg : https://www.unpkg.com/, direct link is https://www.unpkg.com/browse/@ouds/[email protected]/
  • npmjs: https://www.npmjs.com/, directlink is https://www.npmjs.com/package/@ouds/web
  • yarn: https://classic.yarnpkg.com/, direct link is https://classic.yarnpkg.com/en/package/@ouds/web
  • composer: https://getcomposer.org/, not yet deployed, direct link to come
  • NuGet: https://www.nuget.org, direct link is https://www.nuget.org/packages/ouds-web

• Make sure callouts always generate a <p> everywhere, to have the same rendering, because in OUDS paragraphs are limited in width. (and texts should always be in a semantic tag)

Motivation & Context

This page is linked from the homepage

Types of change

• New feature (non-breaking change which adds functionality)

Live previews

• https://deploy-preview-2908--boosted.netlify.app/getting-started/download/

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[MaxLardenois]

Some comments to discuss, nothing blocking except the Package managers section I think.

[MaxLardenois]

In this callout we refer to Bootstrap and not OUDS Web, as we do not have an examples repository this might be ok but I think we should at least mention that Bootstrap's examples are 'somewhat' compatible with OUDS Web... Or getting rid of this callout for now

[vprothais]

This starter is already listed in the "example" page. A callout is available on the example page explaining very briefly how to alert bootstrap example for them to work with Ouds. Maybe we could replace the direct link to the repo here by a link to the starter section of example page (/examples/#starters) ?
@hannahiss what do you think ?