Remove CTA button from mobile

DEPLOYMENT.md

@@ -75,6 +75,7 @@ It is created from [deploy.env.template](deploy.env.template). Current template
 ```env
 APP_VERSION=4.2.3
 ENABLE_GENERAL_ENQUIRIES=false
+PUBLIC_ENABLE_MOBILE_CTA_BUTTON=false
 TZ=Pacific/Auckland
 
 POSTGRES_DB=goodwalk
@@ -100,6 +101,11 @@ After the first deploy, edit `/docker/goodwalk-svelte/.env` on the server and re
 - `RESEND_API_KEY=replace-me`
 - `OWNER_EMAIL=replace-me`
 
+Frontend flags:
+
+- `PUBLIC_ENABLE_MOBILE_CTA_BUTTON=false` keeps the sticky mobile booking CTA hidden.
+- Set `PUBLIC_ENABLE_MOBILE_CTA_BUTTON=true` to show it again.
+
 4. Confirm the shared Docker network already exists:
 
 ```bash