Locations: Use a reusable throttled function

src/organisms/Locations.svelte

@@ -14,7 +14,6 @@
 
     // Variables
     const transitionDuration = 800
-    let clickOrigin = Date.now()
     let filterLocations
     let continentsToDisplay = []
     let continentsFiltered = []
@@ -25,14 +24,10 @@
     continentsFiltered = [...continentsToDisplay]
 
     // Filter by continent
-    // detects if click difference if too short
-    const toggleContinents = (event, continent) => {
-        if (Date.now() - clickOrigin < transitionDuration) {
-            return
-        }
+    // Detects if click difference if too short with a throttled function
+    const toggleContinents = fn.throttled((event, continent) => {
         continentsFiltered = (!continent) ? [...continentsToDisplay] : [continent]
-        clickOrigin = Date.now()
-    }
+    }, transitionDuration)
 
 
     /*