refactor: move dev assets builds output

.gitignore

@@ -9,3 +9,6 @@
 _fresh/
 # npm dependencies
 node_modules/
+
+# Dev assets builds
+static/dev

build.ts

@@ -3,7 +3,7 @@ import { ensureDir } from '$std/fs/mod.ts'
 import { parse, resolve } from '$std/path/mod.ts'
 
 console.log('building styles starts')
-await ensureDir('_fresh/static')
+await ensureDir('_fresh')
 
 try {
 	//prevent Deno from exiting before bundle
@@ -42,12 +42,12 @@ try {
 	})
 
 	await Deno.writeTextFile(
-		'./static/styles.css',
+		'./static/dev/styles.css',
 		new TextDecoder().decode(code),
 	)
 	await Deno.writeTextFile(
-		'./static/styles.map.css',
-		new TextDecoder().decode(map!),
+		'./static/dev/styles.map.css',
+		new TextDecoder().decode(map ?? new Uint8Array()),
 	)
 } catch (error) {
 	console.error(error)