Update examples so they're compatible with `cargo-leptos`

[gbj]

We now have a great build tool released that supports things like synchronized client-server live-reloading. It would be great to update (some or all) of the examples, in particular the ones with both client and server code (hackernews, counter-isomorphic, and todo-app-sqlite and todo-app-cbor in particular) so you can use cargo-leptos to run them.

[GreatGreatGreg]

And you can add tailwindCSS, the most weekly downloaded CSS now.

Leptos is becoming best rust web framwork with great developer experience!

1. Fast: Almost fastest rust web framework according to js-framework-benchmark.
2. HotReload: Instant UI developing feedback. It's already the fastest one.
3. TailwindCSS Intellisense: Some rust web framework do not work because of micro and DSL. Leptos works perfectly.

Thank you

[benwis]

Also we probably want to use the integrations for actix and axum.