Clean up packaging the VS Code vsix

Fix image URLs and add new commands:

* npm run vsix-pack
* npm run vsix-install

Author: mhutch

.github/workflows/build.yml

@@ -60,7 +60,7 @@ jobs:
 
     - name: Pack VSCode Extension
       working-directory: msbuild-editor-vscode
-      run: npx vsce package --no-git-tag-version --pre-release ${{ steps.nbgv.outputs.NpmPackageVersion }}
+      run: npm run vsix-pack
 
     - uses: actions/upload-artifact@v4
       if: startsWith(matrix.os, 'windows')

msbuild-editor-vscode/.vscodeignore

@@ -15,4 +15,4 @@ src/**
 # are correct when the README.md is viewed in the repo. however, they
 # are not needed in the vsix as README.md in the generated package
 # has the paths rewritten to https URLs to the GitHub repo
-/images/**
+images/**

msbuild-editor-vscode/package.json

@@ -8,7 +8,7 @@
   "author": {
     "name": "Mikayla Hutchinson"
   },
-  "icon": "images/icon.png",
+  "icon": "icon.png",
   "repository": {
     "type": "git",
     "url": "https://github.com/mhutch/MonoDevelop.MSBuildEditor.git"
@@ -39,7 +39,9 @@
     "lint": "eslint src --ext ts",
     "test": "vscode-test",
     "publish-server": "dotnet publish ../MSBuildLanguageServer/MSBuildLanguageServer.csproj --configuration Debug --output ./server",
-    "copy-vsix-assets": "cp ../LICENSE . && cp ../art/icon-128.png icon.png"
+    "copy-vsix-assets": "cp ../LICENSE . && cp ../art/icon-128.png icon.png",
+    "vsix-pack": "pwsh -c \"vsce package --baseImagesUrl https://github.com/mhutch/MonoDevelop.MSBuildEditor/raw/HEAD/msbuild-editor-vscode --no-update-package-json --no-git-tag-version --pre-release $(nbgv get-version -v NpmPackageVersion)\"",
+    "vsix-install": "pwsh -c \"npm run vsix-pack && code --install-extension msbuild-editor-$(nbgv get-version -v NpmPackageVersion).vsix\""
   },
   "dependencies": {
     "@vscode/extension-telemetry": "^0.9.0",