🚨 Fix linter warnings of type 'name[casing]'

ansible-lint reads like this:

    name[casing]: All names should start with an uppercase letter.

While at it: Some task/handler names were slightly adapted to better
match what should be done.

roles/nginx_https_ingress/handlers/main.yml

@@ -1,6 +1,6 @@
 # Handlers für nginx-https-proxy
 ---
-- name: restart nginx
+- name: Restart nginx
   service:
     name: nginx
     state: restarted