Fix 404 logo links on THEOlive encoder overview pages

[MattiasBuelens]

Summary

The logo cells in the THEOlive software/hardware encoder overview tables wrapped the image in a raw JSX anchor:

<a href="ffmpeg.md"><FfmpegLogo ... /></a>

Docusaurus only resolves Markdown links to doc files, so the literal ffmpeg.md leaked into the URL and resolved relative to the page, producing 404s like /docs/theolive/software-encoders/ffmpeg.md (reported by Algolia). The neighbouring Markdown links in the same rows (**[FFmpeg](ffmpeg.md)**) were fine.

Fix: turn each logo anchor into a Markdown link wrapping the JSX element, so it goes through the same link resolution:

[<FfmpegLogo ... />](ffmpeg.md)

All 8 logo links now point at the real doc URLs (/docs/theolive/contribution/software-encoders/ffmpeg/, /docs/theolive/hardware-encoders/haivision/, …) with the logo sizing unchanged. These two files were the only places in the docs using an internal doc path inside an <a href>; every other occurrence is an external URL, mailto:, or in-page anchor.

Link to Devin session: https://dolby.devinenterprise.com/sessions/ac9a43deeec54e17a3b07455be9dcc5f
Requested by: @MattiasBuelens

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