move file formats chapter to subfolder

Author: Trolldemorted

src/SUMMARY.md

@@ -54,10 +54,10 @@
     - [Increase Alderman "Found Settlement" Mission Limit](./patches/increase-alderman-found-settlement-limit.md)
     - [Scrollmap Render All Ships](./patches/scrollmap-render-all-ships.md)
     - [Tavern Show All Sailors](./patches/tavern-show-all-sailors.md)
-- [File Formats](./ch70-00-file-formats.md)
-    - [CPR](./ch70-01-cpr.md)
-    - [Navigation Matrix](./ch70-50-navigation-matrix.md)
-    - [Navigation Vector](./ch70-51-navigation-vector.md)
-    - [Navpoint Matrix](./ch70-52-navpoint-matrix.md)
-    - [Fixed Paths](./ch70-53-fixed-paths.md)
+- [File Formats](./file-formats.md)
+    - [CPR](./file-formats/cpr.md)
+    - [Navigation Matrix](./file-formats/navigation-matrix.md)
+    - [Navigation Vector](./file-formats/navigation-vector.md)
+    - [Navpoint Matrix](./file-formats/navpoint-matrix.md)
+    - [Fixed Paths](./file-formats/fixed-paths.md)
 - [Appendix](./ch80-00-appendix.md)