feat: Optional frontmatter logo for page

[sbelkadi]

Addresses FER-3742

Short description of the changes made

Logos can now be configured custom for a specific page, by adding the logo to the frontmatter. The frontmatter takes either a single logo, or logos for both the light and dark themes. Urls and local images are both supported.

What was the motivation & context behind this PR?

A logo override for a specific page previously had to be done via custom js, and often resulted in components flashing as the default logo was overridden.

How has this PR been tested?

Tested locally with changes in Fern CLI ((PR here). Tested with single logo, light logo, and dark logo.

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Name	Status	Preview	Updated (UTC)
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📦 Next.js Bundle Analysis for fern-platform-monorepo

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Playwright test results

 98 passed
 1 flaky
 4 skipped

Details

 103 tests across 10 suites
 1 minute, 9 seconds
 f0a8d73

Flaky tests

chromium › forward-proxy/nextjs.spec.ts › capture the flag

Skipped tests

chromium › posthog.spec.ts › Posthog loads successfully
chromium › proxy.spec.ts › multipart-form upload
chromium › proxy.spec.ts › json request
chromium › websockets/websocket.spec.ts › websocket test