Use template engine library instead of `String.replace`

[20chan]

github-now/src/background/background.ts

Lines 265 to 273 in d757619

	const content = template
	.replace("{CURRENT_PLAYING_SOURCE}", info.src)
	.replace("{CURRENT_PLAYING_NAME}", info.name)
	.replace("{CURRENT_PLAYING_ARTISTS}", info.artists)
	.replace("{CURRENT_PLAYING_ALBUM}", info.album)
	.replace("{CURRENT_PLAYING_RELEASED}", info.year)
	.replace("{CURRENT_PLAYING_ALBUM_SRC}", info.albumCoverImage)
	.replace("{CURRENT_PLAYING_URL}", info.url)
	.replace("{CURRENT_PLAYING_LAST_UPDATED}", format(info.updatedAt, 'MM/DD/YYYY HH:mm'));

• Use lightweight template engine.
• Supports custom date formatting.