Fixes#10284. The `admin.disable` property is no longer supported as of
v3. Instead, to opt-out of serving the Admin Panel, REST API, or GraphQL
API, you must delete their corresponding directories within your Next.js
app. For example, to opt-out of everything, delete the `/app/(payload)`
directory entirely. Or to remove specifically the Admin Panel or API
routes, delete the `/app/(payload)/admin` or `/app/(payload)/api`
directories, respectively. Note: if you've modified the default paths
for these routes via `admin.routes`, delete those directories instead.
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