Installation instructions for ssr are incomplete

[jhoobergs]

The installation instructions on https://leptonic.dev/doc/installation are incomplete for ssr. They do not mention the need to enable the hydrate and ssr features.

hydrate = [..., "leptonic/hydrate"]
ssr = [ ...,     "leptonic/ssr" ]

It took me a while to figure this out, as the error message about js_sys and wasm_bindgen was rather cryptic.

[spencewenski]

Thank you! This helped me figure this issue out for my project as well!