What are you changing in this pull request and why?

This PR updates various links after a PR in dbt Core moved some files. Additionally, it updates some of the links to point to the correct line of code.

Checklist

• Review the Content style guide so my content adheres to these guidelines.
• For docs versioning, review how to version a whole page and version a block of content.
• Add a checklist item for anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."

Adding or removing pages (delete if not applicable):

• Add/remove page in website/sidebars.js
• Provide a unique filename for new pages
• Add an entry for deleted pages in website/static/_redirects
• Run link testing locally with npm run build to update the links that point to deleted pages