vscode-with-extension: improvements

-  Now simply let the default `unpackPhase` unzip the vsix file. This
    should allow users to retrieve the extension directly from github.
 -  Extensions now installed using their unique id as install folder.
 -  Extensions under `vscode-extensions` now use the unique id
    as extension name.

pkgs/misc/vscode-extensions/default.nix

@@ -3,16 +3,23 @@
 let
   inherit (vscode-utils) buildVscodeExtension buildVscodeMarketplaceExtension;
 in
-
+#
+# Unless there is a good reason not to, we attemp to use the same name as the 
+# extension's unique identifier (the name the extension gets when installed
+# from vscode under `~/.vscode`) and found on the marketplace extension page.
+# So an extension's attribute name should be of the form: 
+# "${mktplcRef.publisher}.${mktplcRef.name}".
+#
 rec {
-  nix = buildVscodeMarketplaceExtension {
+  bbenoist.Nix = buildVscodeMarketplaceExtension {
     mktplcRef = {
-        name = "nix";
+        name = "Nix";
         publisher = "bbenoist";
         version = "1.0.1";
         sha256 = "0zd0n9f5z1f0ckzfjr38xw2zzmcxg1gjrava7yahg5cvdcw6l35b";
     };
-
-    # TODO: Fill meta with appropriate information.
+    meta = with stdenv.lib; {
+      license = licenses.mit;
+    };
   };
 }