Update landing page and ground link features

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

랜딩페이지/sample-map-model.ts

@@ -0,0 +1,2 @@
+export const SAMPLE_MAP_CONFIG={initialZoom:7.3,initialCentre:[127.6,36] as [number,number],selectionZoom:14,locationZoom:17,minZoom:5,streetMaxZoom:19,satelliteMaxZoom:23};
+export const mercator=(lon:number,lat:number):[number,number]=>[(lon+180)/360*256,(1-Math.log(Math.tan(Math.PI/4+Math.max(-85,Math.min(85,lat))*Math.PI/360))/Math.PI)/2*256];