make ci also run on windows, re-add css minification

quartz/bootstrap-cli.mjs

@@ -11,7 +11,7 @@ import { intro, isCancel, outro, select, text } from "@clack/prompts"
 import { rimraf } from "rimraf"
 import prettyBytes from "pretty-bytes"
 import { spawnSync } from "child_process"
-import { transform } from "lightningcss"
+import { transform as cssTransform } from "lightningcss"
 
 const UPSTREAM_NAME = "upstream"
 const QUARTZ_SOURCE_BRANCH = "v4-alpha"
@@ -115,6 +115,7 @@ async function stashContentFolder(contentFolder) {
 }
 
 async function popContentFolder(contentFolder) {
+  await fs.promises.rm(contentFolder, { force: true, recursive: true })
   await fs.promises.cp(contentCacheFolder, contentFolder, {
     force: true,
     recursive: true,
@@ -304,6 +305,14 @@ See the [documentation](https://quartz.jzhao.xyz) for how to get started.
           sassPlugin({
             type: "css-text",
             cssImports: true,
+            async transform(css) {
+              const { code } = cssTransform({
+                filename: "style.css",
+                code: Buffer.from(css),
+                minify: true,
+              })
+              return code.toString()
+            },
           }),
           {
             name: "inline-script-loader",