Revert "WIP doc: build sample apps by default"

This reverts commit 433e4e47.
12 jobs for !6 with callbacks/37 in 8 minutes and 17 seconds (queued for 6 seconds)
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Status Job ID Name Coverage
  Build
canceled #367625
amd64 docker
android-arm

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android-arm64

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android-x86

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android-x86_64

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debian

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ios-arm64

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macos
macos

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raspbian-arm

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snap

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win64-llvm

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