docs(#13): add function documentation

src/MiniMap/miniMap.js

@@ -1,3 +1,8 @@
+/**
+ * Initializes the Potree minimap to work with offline map and EPSG:4978 coordinates.
+ *
+ * @param {Potree.Viewer} viewer - The Potree viewer instance
+ */
 export function initMiniMap(viewer) {
   const map = viewer.mapView.map
   const layers = map.getLayers()
@@ -11,6 +16,12 @@ export function initMiniMap(viewer) {
   map.getView().setCenter(center)
 }
 
+/**
+ * Replaces default Open Street Map layer with custom GeoJSON in order for it to work offline.
+ * Also removes the extent layer.
+ *
+ * @param {ol.Collection} layers - Collection of OpenLayers layers
+ */
 function replaceMiniMapLayers(layers) {
   // Remove the old Open Street Map layer
   const oldOSMLayer = layers.item(0)
@@ -30,6 +41,11 @@ function replaceMiniMapLayers(layers) {
   layers.remove(extentLayer)
 }
 
+/**
+ * Overrides the minimap pointer update logic to use 3D coordinates and correct direction.
+ *
+ * @param {Potree.Viewer} viewer - The Potree viewer instance
+ */
 function overrideMapViewUpdate(viewer) {
   const Vector3 = THREE.Vector3
   const Vector2 = THREE.Vector2