docs: fixed path to crates, updated link to translating doc

[viraxslot]

Summary

• actualized contributing guide;
• removed outdated gen-web command from justfile

Test Plan

Manually checked the changes.

[viraxslot]

Looks like this info is outdated too so I can remove it if needed:

Because the website displays the changelog, you should update the website using the following command:

sh
just gen-web

Website is in the separate repo so the command cannot be found:

(fix-contributing)$ just gen-web
cargo codegen-website
error: no such command: `codegen-website`

        View all installed commands with `cargo --list`
        Find a package to install `codegen-website` with `cargo

[ematipico]

True, it's outdated

[viraxslot]

@ematipico removed, but I don't understand the current flow with the website so can't add any new information. If you could suggest what to write I'd love to add it.