Fix multiline descriptions for features in the root module

Author: altavir

src/main/kotlin/space/kscience/gradle/KScienceProjectPlugin.kt

@@ -188,6 +188,12 @@ public open class KScienceProjectPlugin : Plugin<Project> {
 
             inputs.property("features", rootReadmeExtension.features)
 
+            subprojects.forEach { subproject->
+                subproject.extensions.findByType<KScienceReadmeExtension>()?.let {
+                    inputs.property("features-${subproject.name}", it.features)
+                }
+            }
+
             if (rootReadmeExtension.readmeTemplate.exists()) {
                 inputs.file(rootReadmeExtension.readmeTemplate)
             }

src/main/kotlin/space/kscience/gradle/KScienceReadmeExtension.kt

@@ -97,7 +97,7 @@ public class KScienceReadmeExtension(public val project: Project) {
         id: String,
         @Language("File") ref: String? = null,
         name: String = id,
-        description: () -> String,
+        @Language("markdown") description: () -> String,
     ) {
         features += Feature(id, description(), ref, name)
     }
@@ -175,7 +175,7 @@ public class KScienceReadmeExtension(public val project: Project) {
      */
     internal fun featuresString(itemPrefix: String = " - ", pathPrefix: String = ""): String = buildString {
         features.forEach {
-            appendLine("$itemPrefix[${it.name}]($pathPrefix${it.ref ?: "#"}) : ${it.description}")
+            appendLine("$itemPrefix[${it.name}]($pathPrefix${it.ref ?: "#"}) : ${it.description.lines().firstOrNull() ?: ""}")
         }
     }