Sort out markdown setup (hopefully for real)

Restore some lost run configs and cleanup readme, too.

README.md

@@ -308,10 +308,10 @@ API:
 ```kotlin
 val myAwtFamily = myFont.asComposeFontFamily()
 
-// This will attempt to resolve the logical AWT font 
+// This will attempt to resolve the logical AWT font
 val myLogicalFamily = Font("Dialog").asComposeFontFamily()
 
-// This only works in the IntelliJ Platform, 
+// This only works in the IntelliJ Platform,
 // since JBFont is only available there
 val myLabelFamily = JBFont.label().asComposeFontFamily()
 ```

markdown/core/build.gradle.kts

@@ -7,10 +7,10 @@ plugins {
 
 dependencies {
     compileOnly(projects.ui)
-
-    implementation(libs.commonmark.core)
+    api(libs.commonmark.core)
 
     testImplementation(compose.desktop.uiTestJUnit4)
+    testImplementation(projects.ui)
 }
 
 publicApiValidation {

markdown/extension-gfm-alerts/build.gradle.kts

@@ -12,6 +12,8 @@ dependencies {
     compileOnly(libs.commonmark.core)
 
     testImplementation(compose.desktop.uiTestJUnit4)
+    testImplementation(projects.markdown.core)
+    testImplementation(projects.ui)
 }
 
 publicApiValidation {