fix(docs): fix broken url to run-sift.js

[tcope25]

No description provided.

[vladar]

This whole document is out of date. But I guess fixing broken link still makes sense until we fix the document itself 😃

Thanks for this fix!

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[laurieontech]

Hey @vladar, thanks for addressing this one! We're trying to get better at keeping track of stuff that needs updating but gets lost in closed PRs. I've written something up on it here but the gist of it is we're trying to open issues for needed docs changes. Would you be able to open one for this since you appear to have the context? Thanks!