fix: via.placeholder.com shut down in 2024 (now connection-refused)

[kiluazen]

documentation-site/pages/components/menu.mdx references via.placeholder.com/... URLs. The service was shut down in 2024 and the DNS record no longer resolves.

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Why this is needed

via.placeholder.com was shut down in 2024 and its DNS record no longer resolves — every request now hangs or returns a connection error. Browsers render a broken-image icon in place of the intended placeholder.

Verify in any shell:

curl -sI --max-time 3 https://via.placeholder.com/300x200 || echo 'connection refused / DNS gone'

What this PR changes

Fixes both 'Uber Everything' menu-item imgUrl examples in the Base Web Menu docs page so the Menu component docsite renders avatars instead of broken-image icons.

Replacement details

Two distinct occurrences (one double-quoted, one single-quoted) in the same file — both replaced with the identical placehold.co URL shape. No runtime code affected.

Background

I'm tracking dead image-placeholder endpoints (source.unsplash.com/*, via.placeholder.com/*, placekitten.com/*) across public repos as part of tteg, a tiny CLI/HTTP API I built so projects can drop in real Unsplash photos without registering an Unsplash app or managing API keys. tteg is not introduced as a dependency by this PR — the diff uses the dependency-free canonical replacement domain. If you want topic-matched real photos as a follow-up, the no-key HTTP API is at https://tteg-api-53227342417.asia-south1.run.app/search?q=<query>&n=1 (CORS-on, no auth).

One extra artifact you may find handy: a public scanner at https://tteg.kushalsm.com/scan?url= that highlights dead-placeholder patterns in any landing page — useful for verifying the fix lands and for finding other places dead URLs slipped in. Source: https://github.com/kiluazen/tteg-landing/blob/main/scan.html.

Research note covering the broader broken-placeholder landscape: https://github.com/kiluazen/tteg/blob/research-note-autark/RESEARCH.md.

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