Manage key od_config as multiple sub keys instead of json block

[jfv-opensource]

In values.yml replace the content of od_config (currently big file with a lot of comments) by simples sub keys.

Example of target:

...

od_config:
  enabled: true

od_settings:
  title: "abcdesktop"
  language: "en"
  loglevel: "info"
  host: "0.0.0.0"
  port: 443
  auth: "none"
  disable_signup: true
  default_role: "user"
  default_group: "abcdesktop"
  default_shell: "/bin/bash"
  session_timeout: 600
  max_sessions: 20
  max_connections: 100
  disable_share: false
  disable_clipboard: false
  disable_filetransfer: false
  disable_dragdrop: false
  disable_notifications: false
  storage_path: "/var/lib/abcdesktop"
  tmp_path: "/tmp"
  home_path: "/home"
  log_path: "/var/log/abcdesktop"
  icon_theme: "default"
  default_browser: "firefox"
  default_editor: "code"
  timezone: "UTC"
  locale: "en_US.UTF-8"