Simplify dark scss, some fixes, more convenient dark_mode()

resources/views/layouts/app.blade.php

@@ -17,7 +17,7 @@
   <link
     rel="stylesheet"
     id="theme-style"
-    href="{{ dark_mode() ? asset('css/app-dark.css') : asset('css/app.css') }}"
+    href="{{ asset(dark_mode('css/app-dark.css', 'css/app.css')) }}"
     data-light-url="{{ asset('css/app.css') }}"
     data-dark-url="{{ asset('css/app-dark.css') }}">
   <link href="{{ asset('fonts/fa-dtbl-1.css') }}" rel="stylesheet">

resources/views/layouts/main-nav.blade.php

@@ -1,11 +1,11 @@
 {{-- Global navbar --}}
 
-<nav class="navbar navbar-expand-md navbar-{{ dark_mode() ? 'dark' : 'light' }} page-navbar">
+<nav class="navbar navbar-expand-md navbar-{{ dark_mode('dark', 'light') }} page-navbar">
   <div class="container">
     <a class="navbar-brand" href="{{ route('dash') }}" aria-label="Go to Dashboard">
       <img
         id="navbar-logo"
-        src="/images/logo{{ dark_mode() ? '-dark' : '' }}.svg"
+        src="/images/logo{{ dark_mode('-dark', '') }}.svg"
         data-src-light="/images/logo.svg"
         data-src-dark="/images/logo-dark.svg"
         aria-hidden=true