Configure samples/sensortag/

[twyatt]

Configures the SensorTag sample app that was migrated to this repository from sensortag repo (see db8db81).

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Note

Low Risk
Changes are mostly Gradle wiring, CI, and documentation; library APIs are untouched aside from dependency alias renames.

Overview
Wires the migrated SensorTag sample into the Kable repo as a Gradle composite build so it shares the root version catalog, wrapper, and local kable-core instead of a separate repo and duplicate Gradle setup.

Build & deps: Root settings.gradle.kts adds includeBuild("samples/sensortag"); the sample uses includeBuild("../.."), symlinks gradlew / gradle to the parent, and drops its own libs.versions.toml, wrapper, and standalone pages workflow. Root gradle/libs.versions.toml gains Compose, Voyager, Krayon, and sample-related libraries; kable modules switch to the renamed kotlinx-coroutines alias and android.kotlin.multiplatform.library plugin id.

CI & docs: New PR workflows SensorTag / Android, iOS, and Web run from samples/sensortag; root GitHub Pages now bundles Dokka plus the wasm browser build under sensortag/. README and sample README point at in-repo paths and https://juullabs.github.io/kable/sensortag.

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[twyatt]

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