Implement Overview/About page per updated design

[Annikenkbrathen]

Tasks

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1. Implement new page with placeholders #11155
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2. App status section #11156
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3. Navigation section #11157
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4. Documentation section #11158
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5. News section #11408
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6. Create new contact page #11598
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7. Cypress tests - Overview/About page #11159
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8. Manual test - Overview/About page #11160
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9. Remove feature flag for Overview/About page #11495
   3 of 3
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Acceptance criteria

• App status showing available environments and which version is deployed is available
• Navigation links to the different editors/packages are available and link to the correct page
• Documentation section with links to our documentation is available
• Implementation matches with provided design
• [ ] Placeholders are shown for any sections that are not yet implemented