Update Time Travelling Queries Guide

[ashutosh-src]

Update: https://docs.source.network/defradb/guides/time-traveling-queries/

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[jsimnz]

Overall lgtm (more opinions on the LLM use though)

This PR further emphasizes some issue I mentioned in the previous PR about using LLMs for this kind of refactor

• The overall structure of the document isn't consistent with the rest of the docs. Lots of --- page breaks, and most notably is the inclusion of the FAQ section. Although it has useful information, its entirely disconnected from the rest of the pages formatting.
• Links, theres lots of sections/references that could be linked to another page/guide/concept doc, but they have been ommited or entirely deleted in some cases, because the LLM doesn't know the context you are using this for.