Users sometimes get confused about how to set registry url

mcpjungle cli lets you point to the mcpjungle server if it is not running on the default location of 127.0.0.1:8000.

You can either use --registry flag or specify registry_url: http://<ip>:<port> in ~/.mcpjungle.conf.

The cli help message also includes description for the --registry flag.

But some people still get confused about how to set a custom registry url when they deploy mcpjungle remotely.

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This issue tracks ideas to make this more intuitive, ie, make it easier for all users to know how to set custom registry url.

Some ideas:

• Add more info about this in readme doc + CLI main help message.
• CLI should have an init command that sets up the ~/.mcpjungle.conf with default configurations. It also lets the user know that they can configure url from this conf.