docs: remove cknebel from the Steering Commitee (#286)

Remove @cknebel from the Steering Committee, since there hasn't been any participation for a long time.

Author: bfabio

governance/charter.md

@@ -15,7 +15,6 @@ All other tools are community-maintained.
 
 * 🇩🇰 Denmark: [@zorp](https://github.com/zorp) for OS2 Offentlig Digitaliseringsfællesskab
 * 🇫🇷 France: [@bzg](https://github.com/bzg) for the Free Software unit at the Interministerial Digital Directorate
-* 🇩🇪 Germany: [@cknebel](https://github.com/cknebel) (publicplan GmbH)
 * 🇮🇱 Israel: [@ShimonShore](https://github.com/ShimonShore) (Israel Ministry of Science and
   Technology)
 * 🇮🇹 Italy: [@dptdgi](https://github.com/dptdgi) for DTD (Presidenza del Consiglio dei Ministri)
@@ -42,3 +41,4 @@ level.
 
 Active members from the community may be invited as non-voting members with the approval of at
 least the majority of the Steering Committee.
+