Add comprehensive guide on preventing maintainer burnout

## Summary
This PR adds a new comprehensive guide on preventing burnout for open source maintainers.

## What's included
- Recognition of burnout symptoms
- Strategies for setting sustainable boundaries
- Delegation and team-building approaches
- Mental health resources and support

## Why this matters
While the guides cover "Finding Time," there's currently no dedicated resource addressing maintainer burnout a critical issue affecting many contributors. This fills that gap.

Author: probablynotnmp

_articles/preventing-burnout.md

@@ -103,4 +103,4 @@ This PR adds a new comprehensive guide on preventing burnout for open source mai
 - Mental health resources and support
 
 ## Why this matters
-While the guides cover "Finding Time," there's currently no dedicated resource addressing maintainer burnout—a critical issue affecting many contributors. This fills that gap.
+While the guides cover "Finding Time," there's currently no dedicated resource addressing maintainer burnout—a critical issue affecting many contributors. This fills that gap