fix(community): remove two transcript image tags pointing at missing files

[immanuwell]

Two community transcript pages reference screenshots that were never committed, so they 404 on prod and render as broken image icons

• community/2025-07-16-community-meeting-transcript.mdx -> /img/community/2025-07-16/image015.webp
• community/2025-08-20-community-meeting-transcript.mdx -> /img/community/2025-08-20/image004.webp

Docusaurus doesnt validate <img> src paths so the build stays green.
This removes the two dead tags

Repro

curl -sI https://wasmcloud.com/img/community/2025-07-16/image015.webp | head -1
# HTTP/2 404
curl -s https://wasmcloud.com/community/2025-07-16-community-meeting-transcript/ | grep -o image015.webp
# image015.webp   (still in the shipped page)

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