Update VSCodium.rst

I deleted the instructions which did not work for me on Mac oS X.  Maybe they were for an older version of the Scala (Metal) extensions.  

Added some links and text and generally cleared up the page.

source/SpinalHDL/Getting Started/VSCodium.rst

@@ -19,11 +19,9 @@ corner: "Multiple build definitions found. Which would you like to use?". Click
 Wait while running ``sbt bloopInstall``. Then a warning pop-up appears, you can
 ignore it (don't show again).
 
-In the search bar, find and open ``MyTopLevel.scala``. Wait a little bit, and see
-the ``run | debug`` line that is displayed by Metals, before each ``App``. For
-instance, click on ``run`` just above ``object MyTopLevelVerilog``. It performs
+In the search bar, find and open ``MyTopLevel.scala``.  Once it loads select Menu Bar -> Run -> Run Without Debugging.  It performs
 design checks and, as the checks pass, it generates the Verilog file
-``MyTopLevel.v`` at the root of the workspace.
+``MyTopLevel.v`` at the root of the workspace, in ./hw/gen/MyTopLevel.v
 
 This is all you need to do to use Spinal from VSCodium!