Change sass to use local install instead of outdated gradle plugin

build.gradle.kts

@@ -2,6 +2,7 @@ import com.diffplug.gradle.spotless.SpotlessExtension
 import org.springframework.boot.gradle.tasks.bundling.BootJar
 import nl.javadude.gradle.plugins.license.DownloadLicensesExtension
 import nl.javadude.gradle.plugins.license.LicenseExtension
+import java.nio.file.Files
 
 group = "nl.tudelft.submit"
 version = "2.2.0"
@@ -71,8 +72,6 @@ plugins {
     // Open API generator for generating the Client code for Labracore.
 //    is this needed?
 //    id("org.openapi.generator").version("4.2.3")
-
-	id("com.unclezs.gradle.sass").version("1.0.10")
 }
 
 sourceSets {
@@ -218,9 +217,37 @@ tasks.withType<Test>().configureEach {
 }
 
 // Configure the sass compiling task to use the sass and css directories.
-sass {
-	cssPath = "static/css"
-	sassPath = "scss"
+tasks.register("ensureDirectory") {
+    // Store target directory into a variable to avoid project reference in the configuration cache
+    val directories = listOf(file("src/main/resources/static/css"), file("src/main/resources/scss"))
+
+    doLast {
+        directories.forEach { directory ->
+            Files.createDirectories(directory.toPath())
+        }
+    }
+}
+task<Exec>("sassCompile") {
+    dependsOn.add(tasks.getByName("ensureDirectory"))
+    if (System.getProperty("os.name").contains("windows",true)) {
+        commandLine("cmd", "/c", "sass", "src/main/resources/scss:src/main/resources/static/css")
+    } else {
+        commandLine("echo", "Checking for sass or sassc...")
+        doLast {
+            val res = exec {
+                isIgnoreExitValue = true
+                executable = "bash"
+                args = listOf("-l", "-c", "sass --version")
+            }
+            if (res.exitValue == 0) {
+                exec { commandLine("sass", "src/main/resources/scss:src/main/resources/static/css") }
+            } else {
+                File("src/main/resources/scss").listFiles()!!.filter { it.extension == "scss" && !it.name.startsWith("_") }.forEach {
+                    exec { commandLine("sassc", "src/main/resources/scss/${it.name}", "src/main/resources/static/css/${it.nameWithoutExtension}.css") }
+                }
+            }
+        }
+    }
 }
 
 dependencies {