Theme new style header

[carbonrobot]

Initial theming of Header. These changes will be broken down into smaller PRs and iteratively developed

Header - Collapsed

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After

Header - Open Sources

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Header - Open Debug

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After

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 7691c9d2d9b886bdc1ac96de29a768fd2aa5edb6

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

| Name | Type | | -------------- | ----- | | @envyjs/webui | Patch | | @envyjs/apollo | Patch | | @envyjs/core | Patch | | @envyjs/nextjs | Patch | | @envyjs/node | Patch | | @envyjs/web | Patch |

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