chore: chanigng the amount of free custom domains to 1 (#4148)

## Description

Reason is that users are creating several accounts and with 5 per
account, they can easily get way too many custom domains for free.

## Steps for reproduction

1. click button
2. expect xyz

## Code Review

- [ ] hi @kof, I need you to do
  - conceptual review (architecture, feature-correctness)
  - detailed review (read every line)
  - test it on preview

## Before requesting a review

- [ ] made a self-review
- [ ] added inline comments where things may be not obvious (the "why",
not "what")

## Before merging

- [ ] tested locally and on preview environment (preview dev login:
5de6)
- [ ] updated [test
cases](https://github.com/webstudio-is/webstudio/blob/main/apps/builder/docs/test-cases.md)
document
- [ ] added tests
- [ ] if any new env variables are added, added them to `.env` file

Author: kof

apps/builder/app/builder/shared/nano-states/index.ts

@@ -42,7 +42,7 @@ export const $userPlanFeatures = atom<UserPlanFeatures>({
   allowShareAdminLinks: false,
   allowDynamicData: false,
   allowContactEmail: false,
-  maxDomainsAllowedPerUser: 5,
+  maxDomainsAllowedPerUser: 1,
   hasSubscription: false,
   hasProPlan: false,
 });

apps/builder/app/dashboard/dashboard.stories.tsx

@@ -33,7 +33,7 @@ const userPlanFeatures: UserPlanFeatures = {
   allowShareAdminLinks: false,
   allowDynamicData: false,
   allowContactEmail: false,
-  maxDomainsAllowedPerUser: 5,
+  maxDomainsAllowedPerUser: 1,
 };
 
 export const Empty: StoryFn<typeof Dashboard> = () => {
@@ -61,11 +61,7 @@ export const WithProjects: StoryFn<typeof Dashboard> = () => {
       isDeleted: false,
       isPublished: false,
       latestBuild: null,
-      previewImageAsset: {
-        id: "0",
-        projectId: "0",
-        name: "preview.jpg",
-      },
+      previewImageAsset: null,
       previewImageAssetId: "",
       latestBuildVirtual: null,
       marketplaceApprovalStatus: "UNLISTED" as const,

apps/builder/app/shared/db/user-plan-features.server.ts

@@ -59,7 +59,7 @@ export const getUserPlanFeatures = async (
     allowShareAdminLinks: false,
     allowDynamicData: false,
     allowContactEmail: false,
-    maxDomainsAllowedPerUser: 5,
+    maxDomainsAllowedPerUser: 1,
     hasSubscription: false,
     hasProPlan: false,
   };