docs: Add Seed Query docs

[colinmurphy]

Seed Query docs are missing from the current new Faust site.

For reference we used to have docs here - https://web.archive.org/web/20241103184917/https://faustjs.org/reference/seed-query (thanks @ahuseyn)

[ahuseyn]

I'd like to work on this!

[ahuseyn]

PR for docs: wpengine/faustjs#2113