prepare 6.2.11, update dependencies, switch to npm (#374)

Author: aeschli

.github/workflows/node.js.yml

@@ -22,5 +22,5 @@ jobs:
         uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node-version }}
-      - run: yarn --frozen-lockfile
-      - run: yarn test
+      - run: npm ci
+      - run: npm test

.npmignore

@@ -12,7 +12,7 @@ test/
 .travis.yml
 gulpfile.js
 tslint.json
-yarn.lock
+package-lock.json
 azure-pipelines.yml
 .editorconfig
 .mocharc.json

README.md

@@ -39,8 +39,8 @@ Development
 -----------
 
 
-- clone this repo, run yarn
-- `yarn test` to compile and run tests
+- clone this repo, run `npm install``
+- `npm test` to compile and run tests
 
 How can I run and debug the service?
 
@@ -53,8 +53,8 @@ How can I run and debug the service?
 How can I run and debug the service inside an instance of VSCode?
 
 - run VSCode out of sources setup as described here: https://github.com/Microsoft/vscode/wiki/How-to-Contribute
-- run `yarn link` in the folder of `vscode-css-languageservice`
-- use `yarn link vscode-css-languageservice` in `vscode/extensions/css-language-features/server` to run VSCode with the latest changes from `vscode-css-languageservice`
+- run `npm link` in the folder of `vscode-css-languageservice`
+- use `npm link vscode-css-languageservice` in `vscode/extensions/css-language-features/server` to run VSCode with the latest changes from `vscode-css-languageservice`
 - run VSCode out of source (`vscode/scripts/code.sh|bat`) and open a `.css` file
 - in VSCode window that is open on the `vscode-css-languageservice` sources, run command `Debug: Attach to Node process` and pick the `code-oss` process with the `css-language-features` path
 ![image](https://user-images.githubusercontent.com/6461412/94242567-842b1200-ff16-11ea-8f85-3ebb72d06ba8.png)

build/pipeline.yml

@@ -35,10 +35,10 @@ extends:
       - name: vscode-css-languageservice
 
         buildSteps:
-          - script: yarn --frozen-lockfile
+          - script: npm ci
             displayName: Install dependencies
 
-          # the rest of the build steps are part of the 'prepack' script, automatically run when the pipeline invokes 'yarn pack'
+          # the rest of the build steps are part of the 'prepack' script, automatically run when the pipeline invokes 'npm run pack'
 
         tag: ${{ parameters.quality }}
         preReleaseTag: next
@@ -57,7 +57,7 @@ extends:
               - 16.x                   
 
         testSteps:
-          - script: yarn --frozen-lockfile
+          - script: npm ci
             displayName: Install dependencies        
-          - script: yarn test
+          - script: npm test
             displayName: Test npm package