Make elevation API URL configurable via env var

.env

@@ -2,3 +2,4 @@ VUE_APP_API_URL="https://api.sotl.as"
 VUE_APP_WSS_URL="wss://api.sotl.as"
 VUE_APP_PHOTOS_URL="https://photos.sotl.as"
 VUE_APP_PHOTOS_ORIGINAL_URL="https://sotlas-photos.s3.eu-central-003.backblazeb2.com/original"
+VUE_APP_ELEVATION_API_URL="https://ele.sotl.as/api"

src/components/Coordinates.vue

@@ -103,7 +103,7 @@ export default {
       if (!this.latitude || !this.longitude || !this.showElevation) {
         return
       }
-      axios.post('https://ele.sotl.as/api', [[this.latitude, this.longitude]])
+      axios.post(process.env.VUE_APP_ELEVATION_API_URL, [[this.latitude, this.longitude]])
         .then(result => {
           this.elevation = Math.round(result.data[0])
         })

src/components/MapDraw.vue

@@ -396,7 +396,7 @@ export default {
       }
 
       this.loading = true
-      axios.post('https://ele.sotl.as/api', eleCoordinates)
+      axios.post(process.env.VUE_APP_ELEVATION_API_URL, eleCoordinates)
         .then(result => {
           this.chartData = result.data.map((elevation, i) => {
             return {