Remove the legacy js target

Author: Abduqodiri Qurbonzoda

README.md

@@ -9,7 +9,7 @@
 
 Immutable collection interfaces and implementation prototypes for Kotlin.
 
-This is a multiplatform library providing implementations for `jvm`, `js` (both Legacy and IR),
+This is a multiplatform library providing implementations for `jvm`, `js` ([IR](https://kotlinlang.org/docs/js-ir-compiler.html)),
 and all [targets supported by the Kotlin/Native compiler](https://kotlinlang.org/docs/native-target-support.html).
 
 For further details see the [proposal](proposal.md).

benchmarks/build.gradle.kts

@@ -24,7 +24,7 @@ kotlin {
         }
     }
 
-    js(IR) {
+    js {
         nodejs {
 
         }

core/build.gradle.kts

@@ -52,7 +52,7 @@ kotlin {
         }
     }
 
-    js(BOTH) {
+    js {
         nodejs {
             testTask {
                 useMocha {