feat(occ): add default help text with docs link to all commands

[joshtrichards]

Commands that define their own help can still override as needed.

• Resolves: #

Summary

BEFORE

www-data@c34cb6a66eb1:~/html$ ./occ config:list --help
Description:
  List all configs

Usage:
  config:list [options] [--] [<app>]

Arguments:
  app                    Name of the app ("system" to get the config.php values, "all" for all apps and system) [default: "all"]

Options:
      --output[=OUTPUT]  Output format (plain, json or json_pretty, default is plain) [default: "json_pretty"]
      --private          Use this option when you want to include sensitive configs like passwords, salts, ...
  -h, --help             Display help for the given command. When no command is given display help for the list command
  -q, --quiet            Do not output any message
  -V, --version          Display this application version
      --ansi|--no-ansi   Force (or disable --no-ansi) ANSI output
  -n, --no-interaction   Do not ask any interactive question
      --no-warnings      Skip global warnings, show command output only
  -v|vv|vvv, --verbose   Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug

www-data@c34cb6a66eb1:~/html$ 

AFTER

www-data@c34cb6a66eb1:~/html$ ./occ config:list --help
Description:
  List all configs

Usage:
  config:list [options] [--] [<app>]

Arguments:
  app                    Name of the app ("system" to get the config.php values, "all" for all apps and system) [default: "all"]

Options:
      --output[=OUTPUT]  Output format (plain, json or json_pretty, default is plain) [default: "json_pretty"]
      --private          Use this option when you want to include sensitive configs like passwords, salts, ...
  -h, --help             Display help for the given command. When no command is given display help for the list command
  -q, --quiet            Do not output any message
  -V, --version          Display this application version
      --ansi|--no-ansi   Force (or disable --no-ansi) ANSI output
  -n, --no-interaction   Do not ask any interactive question
      --no-warnings      Skip global warnings, show command output only
  -v|vv|vvv, --verbose   Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug

Help:
  More extensive and thorough documentation may be found at https://docs.nextcloud.com

www-data@c34cb6a66eb1:~/html$ 

TODO

• ...

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[come-nc]

But merging a TODO is meh. Any chance of fixing it right away?

[AndyScherzinger]

@joshtrichards fancy to tackle the remaining / introduced 'to do'. Then we can merge this one 🎉