install eslint in vscode-ext lint job

.github/workflows/ci.yml

@@ -176,6 +176,8 @@ jobs:
         working-directory: packages/vscode-ext
     steps:
       - uses: actions/checkout@v2
+      - name: Install dependencies from monorepo level
+        run: cd ../../ && yarn
       - name: Lint the VSCode Extension source code
         run: yarn lint
 

.prettierignore

@@ -12,3 +12,4 @@ packages/squiggle-lang/coverage/
 packages/squiggle-lang/.cache/
 packages/website/build/
 packages/squiggle-lang/src/rescript/Reducer/Reducer_Peggy/Reducer_Peggy_GeneratedParser.js
+packages/vscode-ext/media/vendor/