[DO NOT MERGE] feat: new docs website

[tkajtoch]

Do not merge this PR

The goal of this PR is to let CI deploy new previews whenever we merge updates to feat/new-docs.

[kibanamachine]

Preview staging links for this PR:

• Docs site: https://eui.elastic.co/pr_7416/
• Storybook: https://eui.elastic.co/pr_7416/storybook
• New docs site (in development): https://eui.elastic.co/pr_7416/new-docs/

[JasonStoltz]

buildkite test this

[elasticmachine]

:green_heart: Build Succeeded

• Buildkite Build
• Commit: 131ebb0fdf52df2dc9d0a2dadb6107358b744d1e

History

• :green_heart: Build #2049 succeeded 131ebb0fdf52df2dc9d0a2dadb6107358b744d1e
• :green_heart: Build #1664 succeeded 131ebb0fdf52df2dc9d0a2dadb6107358b744d1e
• :green_heart: Build #1296 succeeded 131ebb0fdf52df2dc9d0a2dadb6107358b744d1e
• :green_heart: Build #1289 succeeded c9187038e8908042676ff4004fdcc16e4b46d4d4
• :green_heart: Build #1242 succeeded 558daf1f7be99fb5ecdf958308bba66214c32e6a
• :green_heart: Build #1225 succeeded 7df01201ba0d85ae1fc03e8dec8f051541ca9355

cc @tkajtoch