Exclude a few extra build files from build

extensions/html-language-features/.vscodeignore

@@ -1,3 +1,4 @@
+build/**
 test/**
 .vscode/**
 server/.vscode/**

extensions/html/.vscodeignore

@@ -1,2 +1,3 @@
+build/**
 test/**
 cgmanifest.json

extensions/markdown-language-features/.vscodeignore

@@ -1,7 +1,9 @@
 test/**
 test-workspace/**
 src/**
+notebook/**
 tsconfig.json
+tsconfig.*.json
 out/test/**
 out/**
 extension.webpack.config.js
@@ -10,3 +12,4 @@ cgmanifest.json
 yarn.lock
 preview-src/**
 webpack.config.js
+esbuild.js

extensions/markdown-math/.vscodeignore

@@ -1,5 +1,9 @@
+src/**
 notebook/**
 extension-browser.webpack.config.js
+extension.webpack.config.js
+esbuild.js
 cgmanifest.json
 yarn.lock
 webpack.config.js
+tsconfig.json

extensions/objective-c/.vscodeignore

@@ -1,2 +1,3 @@
 test/**
 cgmanifest.json
+build/**