Update README to reflect crane repository migration from konveyor to migtools

[Copilot]

The README file contained multiple outdated references to the konveyor organization and community after the crane project migrated to migtools. This was causing broken links and confusion for users trying to access crane-related repositories.

Issues addressed:

• Broken documentation link https://konveyor.github.io/crane/overview/ (404 error)
• Outdated repository references throughout the README pointing to the old konveyor organization
• Inconsistent organization and community references between the current repository location and linked repositories
• Outdated mtrho-operator reference that has been moved to crane-operator

Changes made:

• Fixed the broken intro link by replacing https://konveyor.github.io/crane/overview/ with https://github.com/migtools/crane
• Updated all crane-related repository references from konveyor to migtools organization:
  • konveyor/crane → migtools/crane
  • konveyor/crane-lib → migtools/crane-lib
  • konveyor/crane-plugins → migtools/crane-plugins
  • konveyor/crane-plugin-openshift → migtools/crane-plugin-openshift
  • konveyor/crane-runner → migtools/crane-runner
  • konveyor/crane-ui-plugin → migtools/crane-ui-plugin
  • konveyor/mtrho-operator → migtools/crane-operator
• Updated installation and usage examples to reference the correct repository locations
• Updated community references from "Konveyor community" to "migtools community" for crane-related content to accurately reflect the project's current organizational structure
• Updated the mtrho-operator reference to crane-operator since the repository has been moved

This ensures all repository links are functional and accurately reflect the current project structure after the migration to migtools.

Fixes #165.

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[Copilot]

@kaovilai 👋 This repository doesn't have Copilot instructions. With Copilot instructions, I can understand the repository better, work faster and produce higher quality PRs.

I can generate a .github/copilot-instructions.md file for you automatically. Click here to open a pre-filled issue and assign it to me. I'll write the instructions, and then tag you for review.

[Copilot]

@copilot crane is no longer part of konveyor and moved to migtools. See https://github.com/kubev2v/forklift-console-plugin/pull/27 for similar contexts

Updated all crane-related repository references throughout the README from konveyor to migtools organization to reflect the repository move. This includes crane, crane-lib, crane-plugins, crane-plugin-openshift, crane-runner, crane-ui-plugin, and mtrho-operator. The Konveyor community reference remains intact as crane is still part of the Konveyor ecosystem.

Commit: 782ab13