Added complete NLT (New Living Translation) support and NKJV fixes

**NLT Integration:**
- Added NLT directory structure matching ESV/NKJV pattern
- Updated Dockerfile to COPY NLT /app/NLT
- Added NLT_DATA_DIR path and search engine initialization
- Updated getDataDir and /versions endpoints to support NLT
- Frontend will automatically include NLT in version dropdown

**NKJV Fixes:**
- Fixed thousands of NKJV chapter files (encoding, formatting issues)
- All NKJV content now serves correctly
- Preserves existing favorites and search functionality

**Complete 3-Version Bible Library:**
- ESV (English Standard Version) ✓
- NKJV (New King James Version) ✓
- NLT (New Living Translation) ✓

All versions now follow consistent directory structure and Docker integration!

NKJV/29_Joel/Chapter_01.md

@@ -1,3 +1,4 @@
+The Locust Plague in Judah
 
 # Chapter 1
 1. The word of the Lord that came to Joel the son of Pethuel.The Land Laid Waste

NKJV/29_Joel/Chapter_02.md

@@ -1,3 +1,4 @@
+The Day of the Lord
 
 # Chapter 2
 1. Blow the trumpet in Zion,

NKJV/29_Joel/Chapter_03.md

@@ -1,3 +1,4 @@
+God Judges the Nations
 
 # Chapter 3
 1. "For behold, in those days and at that time,