build(Gradle): Remove the docsHtmlJar task

This task seems to never have been used, so remove it. In case HTML
files should be published to a web site, use the
`dokkatooGeneratePublicationHtml` task directly.

Signed-off-by: Sebastian Schuberth <sebastian@doubleopen.org>

buildSrc/src/main/kotlin/ort-kotlin-conventions.gradle.kts

@@ -175,15 +175,6 @@ tasks.register<Jar>("sourcesJar") {
     from(sourceSets.main.get().allSource)
 }
 
-tasks.register<Jar>("docsHtmlJar") {
-    description = "Assembles a JAR containing the HTML documentation."
-    group = "Documentation"
-
-    dependsOn(tasks.dokkatooGeneratePublicationHtml)
-    from(tasks.dokkatooGeneratePublicationHtml.flatMap { it.outputDirectory })
-    archiveClassifier = "htmldoc"
-}
-
 tasks.register<Jar>("docsJavadocJar") {
     description = "Assembles a JAR containing the Javadoc documentation."
     group = "Documentation"