(PE-40691) document automated steps for failed postgres and adding compilers

[davidmalloncares]

Document automated steps for failed postgres and adding compilers

Summary

Updating the docs to outline the automated approach to recovering from a failed postgres server and also for adding compilers

Checklist

• [n/a] 🟢 Spec tests.
• [n/a] 🟢 Acceptance tests.

Changes include test coverage?

• Yes
• Not needed

Have you updated the documentation?

• Yes, I've updated the appropriate docs
• Not needed

[davidmalloncares]

@GSPatton not sure who needs to review this one?

[GSPatton]

These changes look good to me. The below acceptance criteria are satisfied:

1. Recovery procedures are easier to identify in the docs
2. recovery.md links to automated_recovery.md providing more clarity to users
3. automated_recovery.md documents how to replace a failed PE-PostgreSQL server using the new plan, and how to add/replace a compiler using the add_compiler plan.

Approving. Pending approval from the documentation team.