( •́ _ •̀) Make saved query work in docs

[ChenyuLInx]

resolves https://github.com/dbt-labs/dbt-docs/issues/486 It also need https://github.com/dbt-labs/dbt-core/pull/10168

Description

This PR followed PR from Emily (Thanks!) to add support of saved query node. TBH I don't really know what I wrote and most of the stuff probably can be better refactored into a function, but I don't really know this language so leaving a little bit headache for the future us. You can tell how I feel by the commit but hey it works.

Checklist

• [x] I have read the contributing guide and understand what's expected of me
• [x] I have signed the CLA
• [x] I have run this code in development and it appears to resolve the stated issue
• [x] I have opened an issue to add/update docs, or docs changes are not required/relevant for this PR
• [x] I have run changie new to create a changelog entry

[ChenyuLInx]

Also added the color as @dbeatty10 's illustration!

[dbeatty10]

🚀