docs: step down as maintainer (#917)

This is a direct follow-up to https://gitea.com/gitea/helm-gitea/issues/916.

Over the past months I took an unofficial break. During this time I realized that I don't have the necessary energy and spare time to maintain the Helm Chart long-term - in a way I would like to. Before that break I had ups where I was hyper-focused on the chart, and downs where everything was too much after work. I never found a sweat spot between both. This is not good for me. It is therefore with a heavy heart that I am stepping down as a maintainer.

Signed-off-by: justusbunsi <sk.bunsenbrenner@gmail.com>

Reviewed-on: https://gitea.com/gitea/helm-gitea/pulls/917
Co-authored-by: justusbunsi <sk.bunsenbrenner@gmail.com>
Co-committed-by: justusbunsi <sk.bunsenbrenner@gmail.com>

CODEOWNERS

@@ -1 +1 @@
-charts/* @justusbunsi @pat-s
+charts/* @pat-s

Chart.yaml

@@ -27,8 +27,6 @@ maintainers:
     email: konrad.lother@novum-rgi.de
   - name: Lucas Hahn
     email: lucas.hahn@novum-rgi.de
-  - name: Steven Kriegler
-    email: sk.bunsenbrenner@gmail.com
   - name: Patrick Schratz
     email: patrick.schratz@gmail.com