docs: update OpenEBS Drivers and remove cStor

[krishnaGajabi]

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[krishnaGajabi]

Release Notes: Update Driver Documentation for OpenEBS CSI Drivers

Pull Request: [#615]

Description:

This pull request updates the driver.md documentation to reflect the deprecation of the legacy OpenEBS cStor driver and introduces the recommended CSI drivers for modern OpenEBS deployments. This update adds documentation for Mayastor Replicated PV, Local PV LVM, and Local PV ZFS Data engines.

Changes:

• Deprecated cStor: Marked the OpenEBS cStor driver as deprecated.
• Introduced Mayastor Replicated PV: Added comprehensive documentation for the OpenEBS Mayastor CSI driver, highlighting its capabilities for high-availability replicated persistent volumes.
• Introduced Local PV LVM: Added detailed documentation for the OpenEBS Local PV LVM CSI driver, emphasizing its suitability for high-performance local storage leveraging LVM.
• Introduced Local PV ZFS: Added detailed documentation for the OpenEBS Local PV ZFS CSI driver, emphasizing its suitability for high-performance local storage leveraging ZFS.

Rationale:

The OpenEBS cStor driver is considered legacy and is no longer the recommended solution for new deployments. The CSI drivers for Mayastor, Local PV LVM, and Local PV ZFS offer improved performance, stability, and features. This update ensures that users are guided towards the current best practices for OpenEBS storage provisioning, and now includes ZFS local provisioning.

Impact:

• Users will be provided with clear guidance on using the recommended CSI drivers for Mayastor, Local PV LVM, and Local PV ZFS.
• The documentation will reflect the current state of OpenEBS driver support, including the addition of ZFS based local provisioning.

Testing:

• Documentation has been reviewed for accuracy and clarity.
• Verification that the document builds correctly.
• Verification that all three new drivers have accurate documentation.

[krishnaGajabi]

Hi @xing-yang , this PR includes updates to the documentation with OpenEBS CSI Drivers. Please review the changes and let me know your thoughts. Thanks!"