Add Trahan trip route

layers/trips/trahan-north-carolina-august-2023/get_data.sh

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+#!/bin/sh
+
+FROM="2023-08-24T12:45:00.000Z"
+TO="2023-09-01T21:50:00.000Z"
+URL="https://whereis.chandlerswift.com/api/0/locations?from=$FROM&to=$TO&format=geojson&user=chandler&device=oneplus6t"
+
+curl --silent "$URL" \
+    | python "$(dirname $0)/../../../util/process_owntracks_geojson_to_line.py" \
+    > data.geojson

layers/trips/trahan-north-carolina-august-2023/layer.js

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+import VectorLayer from 'ol/layer/Vector';
+import {Vector as VectorSource} from 'ol/source.js';
+import GeoJSON from 'ol/format/GeoJSON.js';
+
+import {Style, Stroke} from 'ol/style.js';
+
+import url from './data.geojson?url'; // TODO: remove `?url`?
+
+const colors = '135, 0, 226'; // Käthe says lavender
+
+const vectorLayer = new VectorLayer({
+    source: new VectorSource({
+        url: url,
+        format: new GeoJSON,
+    }),
+    style: function(feature, resolution){
+        return new Style({
+            stroke: new Stroke({
+                color: `rgba(${colors},${Math.min(1, Math.pow(resolution/10, 1/4))})`,
+                width: 10/Math.pow(resolution, 1/4),
+            })
+        });
+    },
+});
+
+export default vectorLayer;