Fix PR review issues: breadcrumb margin bug and step numbering

- Fix critical breadcrumb margin bug (20rem → 2rem in custom.css)
- Fix step numbering in billing-subscriptions.mdx (step 5 → step 4)
- Remove extra blank line in CSS variable declarations

Author: hannesrudolph

docs/roo-code-cloud/billing-subscriptions.mdx

@@ -25,7 +25,7 @@ You can find details for them [in the pricing page](https://roocode.com/pricing)
 1. Once logged in, go to Billing: [app.roocode.com/billing](https://app.roocode.com/billing)
 2. Choose your plan and start a trial.
 3. Team only: if prompted, create your organization.
-5. Complete checkout process; you’ll be redirected back to the app.
+4. Complete checkout process; you'll be redirected back to the app.
 6. You'll be invited to create your first Cloud Agent. You can follow the process or go to the home page.
 7. In the home page. [Roomote Control](/roo-code-cloud/roomote-control) unlocks immediately (look under "Connected Workspaces").
 8. Team only: from here on you'll be able to invite your team members.

src/css/custom.css

@@ -28,7 +28,6 @@
   --ring: 0 0% 3.9%;
   --radius: 0.5rem;
 
-
   --chart-1: 0 100% 50%;
   --chart-2: 29 100% 50%;
   --chart-3: 51 100% 50%;
@@ -2030,7 +2029,7 @@ html {
 
 /* Breadcrumbs styling */
 .theme-doc-breadcrumbs {
-  margin-bottom: 20rem;
+  margin-bottom: 2rem;
   margin-left: 1.25rem;
   font-size: 0.875rem;
 }