allow listing all config keys and descriptions

[jyecusch]

Allows user to list all available config keys with nitric config -l and the current values with nitric config.

Fixes NIT-74

[vercel]

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[jyecusch]

Some example usage of the config and config list options:

When the current project has a local config file

nitric config
Config file: .nitric/config.yaml
=============================
url: http://localhost:3000

Where there is a global config file

nitric config
Config file: /Users/jye/.nitric/config.yaml
=============================
url: http://localhost:3000

When there is no config file

nitric config
Config file: none (using defaults)
=============================
url: https://app.nitric.io/ (default)

Listing all keys

nitric config -l
Available configuration keys:
=============================
url: The base URL of the Nitric server (e.g., https://app.nitric.io)

Screenshot

[jyecusch]

This also fixes a bug with the set command, which would fail if the config dir hadn't already been created

[vercel]

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1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
nitric-docs	⬜️ Ignored (Inspect)	Visit Preview		Jul 14, 2025 11:55pm

[tjholm]

Would probably make list a command instead of a flag, but happy with the implementation.