moved callback to leptos root and improved design #869

Job	Run time
get-leptos-changed / Detect Source Change	6s
CI (integrations/axum) / Run ci (nightly)	16m 12s
CI (integrations/utils) / Run ci (nightly)	18m 30s
CI (integrations/actix) / Run ci (nightly)	17m 18s
CI (integrations/viz) / Run ci (nightly)	16m 28s
CI (leptos) / Run ci (nightly)	18m 44s
CI (leptos_config) / Run ci (nightly)	15m 40s
CI (leptos_dom) / Run ci (nightly)	19m 2s
CI (leptos_hot_reload) / Run ci (nightly)	14m 38s
CI (leptos_macro) / Run ci (nightly)	19m 2s
CI (leptos_server) / Run ci (nightly)	18m 59s
CI (leptos_reactive) / Run ci (nightly)	19m 1s
CI (router) / Run ci (nightly)	19m 2s
CI (meta) / Run ci (nightly)	19m 1s
CI (server_fn) / Run ci (nightly)	15m 55s
CI (server_fn_macro) / Run ci (nightly)	17m 38s
CI (server_fn/server_fn_macro_default) / Run ci (nightly)	18m 9s
	4h 43m 25s

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