docs: Set link to stm32mp

docs/mkdocs.yml

@@ -14,11 +14,11 @@ theme:
   feature:
     tabs: true
     releases:
-      - name: 'Rocko'
+      - name: 'BSP i.MX6 (Rocko)'
         path: 'yocto-exceet/build-exceet-rocko'
         current: true
         latest: true
-      - name: 'Morty'
+      - name: 'BSP i.MX6 (Morty)'
         path: 'yocto-exceet/build-exceet-morty'
         current: false
         latest: false
@@ -26,6 +26,10 @@ theme:
         path: 'pi-tron/build-kontron-raspbian-stretch'
         current: false
         latest: false
+      - name: 'BSP STM32MP'
+        path: 'yocto-exceet/build-stm32mp'
+        current: false
+        latest: false
   custom_dir: '/tmp/mkdocs-material-kontron/material'
 
 site_url: https://docs.kontron-electronics.de/