Rename element class 'board' to 'gameboard'

src/modules/game/soldier.js

@@ -77,7 +77,7 @@ export function place(svg, selected, cell) {
       trace.dataset.allegiance = selected.dataset.allegiance;
       trace.classList.add('move-trace');
 
-      svg.querySelector('.board').prepend(trace);
+      svg.querySelector('.gameboard').prepend(trace);
     } else {
       points = `${trace.getAttribute('points')} ${current.x},${current.y}`;
     }

src/modules/gameboard.js

@@ -105,7 +105,7 @@ function drawSightLine(sourceCell, targetCell) {
   const hexes = svg.querySelectorAll(selector);
   sightLine.setHexes(hexes);
   const line = sightLine.create(getCellPosition(sourceCell), getCellPosition(targetCell));
-  svg.querySelector('.board').appendChild(line);
+  svg.querySelector('.gameboard').appendChild(line);
   distanceCallback && distanceCallback(hexes.length - 1);
 }