chore: fixed the npm script and added css build file

Author: anikethsaha

Diff for: .vscode/settings.json

@@ -1,3 +1,4 @@
 {
-  "prettier.eslintIntegration": true
+  "editor.defaultFormatter": "esbenp.prettier-vscode",
+  "editor.formatOnSave": true
 }

Diff for: build/css.js

@@ -0,0 +1,41 @@
+const fs = require('fs')
+const path = require('path')
+const {spawn} = require('child_process')
+
+const args = process.argv.slice(2)
+fs.readdir(path.join(__dirname, '../src/themes'), (err, files) => {
+    if (err) {
+        console.log('err', err)
+        return
+    }
+    files.map(async (file) => {
+        if (/\.styl/g.test(file)) {
+            var stylusCMD;
+            const stylusBin = ['node_modules', 'stylus', 'bin', 'stylus'].join(path.sep)
+            var cmdargs = [
+                stylusBin,
+                `src/themes/${file}`,
+                '-u',
+                'autoprefixer-stylus'
+            ]
+            cmdargs = cmdargs.concat(args)
+
+            stylusCMD = spawn('node', cmdargs, { shell: true })
+
+            stylusCMD.stdout.on('data', (data) => {
+                console.log(`[Stylus Build ] stdout: ${data}`);
+            });
+
+            stylusCMD.stderr.on('data', (data) => {
+                console.error(`[Stylus Build ] stderr: ${data}`);
+            });
+
+            stylusCMD.on('close', (code) => {
+                console.log(`[Stylus Build ] child process exited with code ${code}`);
+            });
+        } else {
+            return
+        }
+
+    })
+})