Refactor and document output path (#28)

* Updated output path builder to better use yt-dlp variables

* Added UI explaining output template options

* Fixed outdated reference in dockerfile

assets/tailwind.config.js

@@ -11,7 +11,8 @@ module.exports = {
   darkMode: 'class',
   theme: {
     fontFamily: {
-      satoshi: ['Satoshi', 'sans-serif']
+      satoshi: ['Satoshi', 'sans-serif'],
+      ...defaultTheme.fontFamily
     },
     screens: {
       '2xsm': '375px',