Incorporate latest Ansible best practices into Appendix B

[geerlingguy]

I wrote Appendix B a few years ago, and I've updated and changed some of my 'best practices' based on growth, new features and functionality, and shifts based on community patterns.

A few posts I'd like to incorporate:

• Ansible best practices: using project-local collections and roles
• How to evaluate community Ansible roles for your playbooks

[geerlingguy]

I have incorporated two new sections into the best practices appendix.