Adding Bootstrap theme uri field to settings

BTCPayServer/Services/PoliciesSettings.cs

@@ -15,5 +15,8 @@ namespace BTCPayServer.Services
 
         [JsonProperty(DefaultValueHandling = DefaultValueHandling.Populate)]
         public bool LockSubscription { get; set; }
+
+        [JsonProperty(DefaultValueHandling = DefaultValueHandling.Populate)]
+        public string CustomBootstrapThemeCssUri { get; set; }
     }
 }

BTCPayServer/Views/Server/Policies.cshtml

@@ -15,6 +15,15 @@
 <div class="row">
     <div class="col-md-6">
         <form method="post">
+            <div class="form-group">
+                <label asp-for="CustomBootstrapThemeCssUri"></label>
+                <input asp-for="CustomBootstrapThemeCssUri" class="form-control" />
+                <span asp-validation-for="CustomBootstrapThemeCssUri" class="text-danger"></span>
+                <p class="form-text text-muted">
+                    <a href="https://bootstrap.build/app/v4.0/" target="_blank">Build your own theme</a>
+                    or <a href="https://bootswatch.com/" target="_blank">pick one already made</a>
+                </p>
+            </div>
             <div class="form-group">
                 <label asp-for="RequiresConfirmedEmail"></label>
                 <input asp-for="RequiresConfirmedEmail" type="checkbox" class="form-check-inline" />

BTCPayServer/Views/Shared/_Layout.cshtml

@@ -19,6 +19,8 @@
     @* CSS *@
     <bundle name="wwwroot/bundles/main-bundle.min.css" />
 
+
+
     @* JS *@
     <bundle name="wwwroot/bundles/main-bundle.min.js" />
 </head>