Yew app dependency maintenance

[Madoshakalaka]

dependency selection seems a bit arbitrary. wasm-bindgen-futures is maybe less needed as we now have use_future and yew::platform

[dependencies]
yew = { version = "0.23", features = ["csr"] }
wasm-bindgen = "0.2.88"
web-sys = "0.3"
js-sys = "0.3"
wasm-bindgen-futures = "0.4"
gloo = "0.11"
chrono = "0.4.24"
implicit-clone = "0.6"
anyhow = "1.0.70"
serde_json = "1.0.95"
tracing = "0.1.37"
rand = "0.8.5"
serde = { version = "1.0.159", features = ["derive"] }
getrandom = { version = "0.2.8", features = ["js"] }

predefined code snippets utilizing some of these deps might be a nice feature. (How about yew's examples??)

we also want to set up dependabot. rand is very outdated.