fix: replace placeImg with static image on Asset examples

[massao]

Purpose of PR

Replace usage of placeimg with asset from Contentful's image service on Asset examples

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Latest commit: e1e0075

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Name	Status	Preview	Comments	Updated
forma-36	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Feb 16, 2023 at 1:25PM (UTC)

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
CommonJS	121.33 KB (0%)	2.5 s (0%)	73 ms (-16.77% 🔽)	2.5 s
Module	118.12 KB (0%)	2.4 s (0%)	98 ms (+32.26% 🔺)	2.5 s