What are you changing in this pull request and why?

Intermediate guide for preparing to upgrade to Fusion and upgrading to Fusion:

• Adds 2 brand new guides
• Updates guides page with a Fusion block
• This work will be linked to in PR (Coming soon)

Checklist

• The changes in this PR meet the docs style guide/fundamentals required for all content.
• Applied the proper versioning rules if the content is for specific dbt version(s): (version a whole page or version a block of content
• The content in this PR requires a dbt release note, so I added one to the release notes page.).

🚀 Deployment available! Here are the direct links to the updated files:

• https://docs-getdbt-com-git-upgrade-guide-dbt-labs.vercel.app/docs/configure-dbt-extension
• https://docs-getdbt-com-git-upgrade-guide-dbt-labs.vercel.app/docs/fusion/about-fusion
• https://docs-getdbt-com-git-upgrade-guide-dbt-labs.vercel.app/docs/fusion/fusion
• https://docs-getdbt-com-git-upgrade-guide-dbt-labs.vercel.app/docs/fusion/get-started-fusion
• https://docs-getdbt-com-git-upgrade-guide-dbt-labs.vercel.app/docs/fusion/install-dbt-extension
• https://docs-getdbt-com-git-upgrade-guide-dbt-labs.vercel.app/docs/fusion/install-fusion-cli
• https://docs-getdbt-com-git-upgrade-guide-dbt-labs.vercel.app/docs/fusion/install-fusion
• https://docs-getdbt-com-git-upgrade-guide-dbt-labs.vercel.app/docs/install-dbt-extension
• https://docs-getdbt-com-git-upgrade-guide-dbt-labs.vercel.app/docs/introduction
• https://docs-getdbt-com-git-upgrade-guide-dbt-labs.vercel.app/guides/_config
• https://docs-getdbt-com-git-upgrade-guide-dbt-labs.vercel.app/guides/fusion-qs
• https://docs-getdbt-com-git-upgrade-guide-dbt-labs.vercel.app/guides/fusion-upgrade-prepare
• https://docs-getdbt-com-git-upgrade-guide-dbt-labs.vercel.app/guides/fusion-upgrade
• https://docs-getdbt-com-git-upgrade-guide-dbt-labs.vercel.app/reference/resource-configs/static-analysis