Added best practice recommendations for using DFS with Octopus Server

[gian-lorenzetto]

Clarified DFS usage with Octopus Server, for both single and multi-node configurations.

• Added a new best practices page for DFS configuration
• Removed DFS as an example from the installation guidelines
• Updated the DFS link from the HA design page to the new DFS recommendations information

[CLAassistant]

All committers have signed the CLA.

[gian-lorenzetto]

[sc-7742]

[shortcut-integration[bot]]

This pull request has been linked to Shortcut Story #7742: Update public DFS recommendations.

[gian-lorenzetto]

Updated the single- and multi-node images, just waiting on the redundancy image before merging.

[gian-lorenzetto]

Made some minor (Grammarly inspired) suggestions, and one for a warning callout

Thanks @harrisonmeister I've accepted your changes. This is good to go from my side now, thanks for the reviews @harrisonmeister and @jbristowe.