Create a unique header

[mlqn]

Description

We currently use two different components for the header (Header.tsx and AltinnHeader.tsx) which leads to visual inconsistencies (e.g different heights, padding, shadow, logo size, menu components, etc).

I suggest merging these two headers into a single, customizable header. This header should be responsive and should work on small screens. We should also consider making it work for unauthenticated users.

We should also replace the <div> tag with the right semantic tag <header>.

Dashboard

dashboard and resourceadm uses Header.tsx

Editor

editor (app-development) and preview uses AltinnHeader.tsx

Additional Information

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Tasks

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Acceptance Criterias

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