Dead link to tools/publish.sh

[MichalGniadek]

While browsing the docs, I've noticed that one of the links goes to GitHub's 404. I don't know what's the correct location for the file currently, so I'm just making an issue.

bevy-website/content/learn/contribute/helping-out/opening-pull-requests.md

Line 93 in 32cf2a4

1. Add the new crate to the [tools/publish.sh](https://github.com/bevyengine/bevy/blob/main/tools/publish.sh) file.

[mockersf]

this doesn't exist anymore and is not needed, it can be removed