Add vscode extension recommendations

It's the most common editor for core team members and probably
contributors as well, so it's nice to make it easier for those
to get their environment set up with the most important extensions.

.gitignore

@@ -28,7 +28,8 @@ node_modules
 # IDE files
 .idea/
 *.sublime-*
-.vscode/
+.vscode/*
+!.vscode/extensions.json
 
 # testing
 .coverage

.vscode/extensions.json

@@ -0,0 +1,21 @@
+{
+  "recommendations": [
+    // linters
+    "dbaeumer.vscode-eslint",
+    "esbenp.prettier-vscode",
+    "stylelint.vscode-stylelint",
+    // python
+    "ms-python.python",
+    "ms-python.vscode-pylance",
+    // other file formwards we use
+    "redhat.vscode-yaml",
+    "samuelcolvin.jinjahtml",
+    // misc
+    "ms-vscode.references-view",
+    "jakearl.search-editor-apply-changes",
+  ],
+  "unwantedRecommendations": [
+    "ms-azuretools.vscode-docker",
+    "ms-edgedevtools.vscode-edge-devtools",
+  ]
+}