Changes

landing: copy pass — courier value proposition, step 4, spacing, footer

- Step 4 now says what actually happens: if the other clinic is on Blut24 too,
  order, delivery note and unit data stay inside the system with nothing retyped
  or faxed; DGTI-Lieferschein, PDF and e-mail remain available for houses that
  are not yet connected, rather than being the default path.
- Courier section rewritten around the app: orders arrive on the phone, pickup
  and delivery are confirmed there, and participation is free so a courier can
  win additional runs without buying software. Kept strictly to goods transport
  wording - no patient-transport terms.
- "dauerhaft kostenlos" -> "für Kliniken kostenlos" everywhere.
- Tightened the gap between the header and the hero headline on both breakpoints.
- Dropped the Bundes-Klinik-Atlas source line from the footer.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
 (commit: 4476c9c)