docs: rename 'documentation-fit-connect' to 'fit-connect'

...and also add child resources

content/resources/dokumentation-fit-connect/dokumentation-fit-connect.md → content/resources/fit-connect/fit-connect.md

 ---
+childResources:
+- name: FIT-Connect Routing API
+  slug: routing-api
+- name: FIT-Connect Submission API
+  slug: submission-api
 contactInformation:
   mail: fit-connect@fitko.de
   name: FIT-Connect Produktteam (FITKO)
@@ -7,7 +12,7 @@ developer:
   url: https://www.it-planungsrat.de/
 docsUrl: https://docs.fitko.de/fit-connect/docs
 logo:
-  path: public/img/resources/dokumentation-fit-connect/df94f47069316480.jpeg
+  path: public/img/resources/fit-connect/df94f47069316480.jpeg
   title: FIT-Connect Logo
 name: FIT-Connect
 shortDescription: FIT-Connect stellt eine Infrastruktur, APIs und SDKs zum Versand