vscode: address some OOB feedback

Remove the now extraneous `createDevPackage` script in favour of
`dev-package`.  Update the README.md accordingly.  Additionally, restore
the ignore rule for the test VSCode instance.

The gitignore is already configured to ignore vsix files, and vsce will
implicitly ignore the vsix files when packaging so we do not run the
risk of committing or distributing the vsix accidentally.

Author: compnerd

Editors/vscode/.vscodeignore

@@ -2,4 +2,5 @@
 **/tsconfig.json
 .gitignore
 .vscode/
-node_modules/
+.vscode-test/
+node_modules/

Editors/vscode/README.md

@@ -19,7 +19,8 @@ The following commands build the extension and creates a `.vsix` package in the
 
 ```
 $ cd Editors/vscode
-$ npm run createDevPackage
+$ npm install
+$ npm run dev-package
 ```
 
 You can install the package from the command-line using the `code` command if available (see [Launching from the command line](https://code.visualstudio.com/docs/setup/mac#_launching-from-the-command-line)).

Editors/vscode/package.json

@@ -27,7 +27,6 @@
         "esbuild-watch": "npm run -S esbuild-base -- --sourcemap --watch",
         "package": "vsce package",
         "dev-package": "vsce package -o sourcekit-lsp-development.vsix",
-        "createDevPackage": "npm install && ./node_modules/.bin/vsce package -o ./out/sourcekit-lsp-vscode-dev.vsix"
     },
     "dependencies": {
         "vscode-languageclient": "^7.0.0"