refactor: update file paths in poker documentation

Remove the `parts/` and `setup/` prefixes from file references in
`games/poker/poker.md` to match the updated file structure.

games/poker/poker.md

@@ -20,7 +20,7 @@ picks a cell from the `13×4` face sheet (`cards-13x4.jpg`) — 13 ranks across,
 4 suits down. All cards share the same back from the `4×1` back sheet
 (`back-4x1.png`).
 
-```yaml file=parts/cards.yaml
+```yaml file=cards.yaml
 role: part
 type: card
 face: ./cards-13x4.jpg
@@ -30,7 +30,7 @@ fillet: 2
 $variants: ./cards.csv
 ```
 
-```csv file=parts/cards.csv
+```csv file=cards.csv
 id,rank,suit,faceCrop,backCrop
 string,string,string,[number;number;number;number],[number;number;number;number]
 2s,2,spades,[0;0;13;4],[0;0;4;1]
@@ -92,7 +92,7 @@ ac,A,clubs,[12;3;13;4],[0;0;4;1]
 A table with a draw pile on the left and five community-card slots across the
 middle. The deck pile fans its stacked cards along a curve.
 
-```yaml file=parts/board.yaml
+```yaml file=board.yaml
 type: board
 id: poker
 role: surface
@@ -111,7 +111,7 @@ layout:
       $variants: ./community.csv
 ```
 
-```csv file=parts/community.csv
+```csv file=community.csv
 slot,x,y,rotation
 string,number,number,number
 0,-100,0,0
@@ -126,7 +126,7 @@ string,number,number,number
 Deal the whole deck onto the draw pile (`poker:card` expands to every card of
 that type), then flip a flop onto the community slots.
 
-```yaml file=setup/main.yaml
+```yaml file=main.yaml
 role: setup
 type: game
 id: main