trackers: group cars, trains, planes and wildlife under one spotting tracker with /trackers/spotting landing page and category switcher

src/lib/title.ts

@@ -19,6 +19,7 @@ export function getTitle(path: string, environment: SiteEnvironment = null): str
 		'/projects': 'Projects',
 		'/trackers': 'Trackers',
 		'/trackers/books': 'Books',
+		'/trackers/spotting': 'Spotting',
 		'/trackers/cars': 'Cars',
 		'/trackers/planes': 'Planes',
 		'/trackers/trains': 'Trains',