Feature: Center YETI link from a route if no gpx

[AntoineMarnat]

Is your feature request related to a problem? Please describe.
When browsing (winter) routes, clicking the YETI link below the map box. If the route has a gpx file, it opens YETI centered on the gpx (perfect). If no gpx file, it opens YETI with map at very large scale (full alps). This is not ergonomic, one has to zoom again.

Describe the solution you'd like
If no gpx file attached to the route, use the same centering as for the mapbox (square around associated waypoints)

See

c2c_ui/src/views/document/utils/boxes/MapBox.vue

Line 42 in 0456709

<router-link v-if="showYetiButton" :to="yetiUrl" class="button is-small">

c2c_ui/src/views/document/utils/boxes/MapBox.vue

Line 114 in 0456709

yetiUrl() {

src/components/yeti/YetiMap.vue