docs(main): remove registry to sealos Experimental

[cuisongliu]

🤖 Generated by Copilot at a16be52

Summary

🛠️🐳📝

This pull request refactors the sealctl tool to use command groups and templates, and adds a new subcommand group for container and image management using the buildah package. It also renames the tool to sealos and updates the documentation and examples accordingly. It removes several redundant functions from the cmd package and registers them in the rootCmd of the cmd/sealos/cmd/root.go file.

We are the sealos, we command the cluster
We refactor the code, we make it faster
We use the buildah, we manage the images
We are the sealos, we are the experimental

Walkthrough

• Refactor the subcommands of the sealctl tool into command groups and templates, and integrate the buildah package as a subcommand group for container and image management (link, link, link, link, link, link, link, link, link)
• Rename the sealctl tool to sealos and update the documentation and examples accordingly (link, link, link, link, link, link, link)
• Simplify the global variables and flags of the sealos tool and update the short description of the tool (link, link)
• Provide an experimental command for saving images to a local registry (link, link, link, link, link, link)

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (8f94803) 72.30% compared to head (a16be52) 72.30%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3047   +/-   ##
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  Coverage   72.30%   72.30%           
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  Files           8        8           
  Lines         603      603           
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  Hits          436      436           
  Misses        132      132           
  Partials       35       35           

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