sbt2 prep: drop scalajs-bundler from the js fixture

The fixture keeps its @jsimport facade, which only has to compile; no
test runs the npm module. mdoc's own docs already steer users away from
the bundler, and it has no sbt 2 build, which is what blocked the switch.

Author: kitbellew

build.sbt

@@ -302,13 +302,9 @@ val jsdocs = project
       _.withModuleKind(ModuleKind.CommonJSModule)
     },
     depJsDom,
-    scalaJSUseMainModuleInitializer := true,
-    Compile / npmDependencies ++= List(
-      "ms" -> "2.1.1"
-    ),
-    webpackBundlingMode := BundlingMode.LibraryOnly()
+    scalaJSUseMainModuleInitializer := true
   )
-  .enablePlugins(ScalaJSPlugin, ScalaJSBundlerPlugin)
+  .enablePlugins(ScalaJSPlugin)
 
 val jswebsitedocs = project
   .in(file("tests/websiteJs"))

project/plugins.sbt

@@ -4,8 +4,6 @@ addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.12.0")
 
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.22.0")
 
-addSbtPlugin("ch.epfl.scala" % "sbt-scalajs-bundler" % "0.21.1")
-
 addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.5.12")
 
 val crossProjectV = "1.3.2"