fix dockerfile warnings and hugo config deprecations

Dockerfile

@@ -33,11 +33,11 @@ RUN wkhtmltopdf --enable-internal-links --enable-local-file-access \
 FROM docker.io/nginxinc/nginx-unprivileged:1.27-alpine
 
 LABEL maintainer acend.ch
-LABEL org.opencontainers.image.title "acend.ch's Kubernetes Basics Training"
-LABEL org.opencontainers.image.description "Container with acend.ch's Kubernetes Basics Training content"
-LABEL org.opencontainers.image.authors acend.ch
-LABEL org.opencontainers.image.source https://github.com/acend/kubernetes-basics-training/
-LABEL org.opencontainers.image.licenses CC-BY-SA-4.0
+LABEL org.opencontainers.image.title="acend.ch's Kubernetes Basics Training"
+LABEL org.opencontainers.image.description="Container with acend.ch's Kubernetes Basics Training content"
+LABEL org.opencontainers.image.authors="acend.ch"
+LABEL org.opencontainers.image.source="https://github.com/acend/kubernetes-basics-training/"
+LABEL org.opencontainers.image.licenses="CC-BY-SA-4.0"
 
 EXPOSE 8080
 

config/_default/config.toml

@@ -114,8 +114,8 @@ breadcrumb_disable = false
 sidebar_search_disable = false
 #  Set to false if you don't want to display a logo (/assets/icons/logo.svg) in the top nav bar
 navbar_logo = true
-# Set to true to disable the About link in the site footer
-footer_about_disable = true
+# Set to false to disable the About link in the site footer
+footer_about_enable = false
 
 ############################## social links ##############################
 [params.links]