fix: multiple server deployments

feat: custom preview deployment fqdn
ui: improvements here and there

resources/views/livewire/project/application/preview/form.blade.php

@@ -8,6 +8,8 @@
     <div class="flex flex-col gap-2 pb-4">
         <x-forms.input id="application.preview_url_template" label="Preview URL Template"
             helper="Templates:<span class='text-helper'>@@{{ random }}</span> to generate random sub-domain each time a PR is deployed, <span class='text-helper'>@@{{ pr_id }}</span> to use pull request ID as sub-domain or <span class='text-helper'>@@{{ domain }}</span> to replace the domain name with the application's domain name." />
-        <div class="">Domain Preview: {{ $preview_url_template }}</div>
+        @if ($preview_url_template)
+            <div class="">Domain Preview: {{ $preview_url_template }}</div>
+        @endif
     </div>
 </form>