feat(ui): Implement Custom CSS configuration (#943)

* feat(ui): Implement Custom CSS configuration

* Update web/app/public/index.html

api/custom_css.go

@@ -0,0 +1,14 @@
+package api
+
+import (
+	"github.com/gofiber/fiber/v2"
+)
+
+type CustomCSSHandler struct {
+	customCSS string
+}
+
+func (handler CustomCSSHandler) GetCustomCSS(c *fiber.Ctx) error {
+	c.Set("Content-Type", "text/css")
+	return c.Status(200).SendString(handler.customCSS)
+}