Added an appointment cancellation button

resources/views/vendor/mail/text/button.blade.php

@@ -0,0 +1 @@
+{{ $slot }}: {{ $url }}

resources/views/vendor/mail/text/footer.blade.php

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+{{ $slot }}

resources/views/vendor/mail/text/header.blade.php

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+[{{ $slot }}]({{ $url }})

resources/views/vendor/mail/text/layout.blade.php

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+{!! strip_tags($header) !!}
+
+{!! strip_tags($slot) !!}
+@isset($subcopy)
+
+{!! strip_tags($subcopy) !!}
+@endisset
+
+{!! strip_tags($footer) !!}

resources/views/vendor/mail/text/message.blade.php

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+@component('mail::layout')
+    {{-- Header --}}
+    @slot('header')
+        @component('mail::header', ['url' => config('app.url')])
+            {{ config('app.name') }}
+        @endcomponent
+    @endslot
+
+    {{-- Body --}}
+    {{ $slot }}
+
+    {{-- Subcopy --}}
+    @isset($subcopy)
+        @slot('subcopy')
+            @component('mail::subcopy')
+                {{ $subcopy }}
+            @endcomponent
+        @endslot
+    @endisset
+
+    {{-- Footer --}}
+    @slot('footer')
+        @component('mail::footer')
+            © {{ date('Y') }} {{ config('app.name') }}. @lang('All rights reserved.')
+        @endcomponent
+    @endslot
+@endcomponent

resources/views/vendor/mail/text/panel.blade.php

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+{{ $slot }}

resources/views/vendor/mail/text/subcopy.blade.php

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+{{ $slot }}

resources/views/vendor/mail/text/table.blade.php

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+{{ $slot }}