chore: remove broken link from bug issue template

[Conduitry]

As discussed briefly in chat, these was a now-broken link in the bug issue template for how to try to make a reproduction in Vite. We don't have this information anymore, and we probably don't want to maintain it. If people are up for it, they can continue to try to reproduce bugs in Vite, but otherwise they'll just go ahead an open issues in Kit like they do now.

Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

• It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
• This message body should clearly illustrate what problems it solves.
• Ideally, include a test that fails without this PR but passes with it.

Tests

• Run the tests with pnpm test and lint the project with pnpm lint and pnpm check

Changesets

• If your PR makes a change that should be noted in one or more packages' changelogs, generate a changeset by running pnpm changeset and following the prompts. Changesets that add features should be minor and those that fix bugs should be patch. Please prefix changeset messages with feat:, fix:, or chore:.