James/vectors

[jbaross-pometry]

What changes were proposed in this pull request?

• Updated docstrings for raphtory/src/python/packages/vectors.rs and raphtory/src/python/types/wrappers/document.rs for clarity and grammar.
• Added a userguide page to describe the vertor tools at a conceptual level
• Added a simple example of retriving results and feeding into an LLM
  • This example isn't great becuse I didn't have rich data to demo the templates with or ask more interesting queries.
  • Template strings also seem to break mkdocs when included in code fences

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It looks like some things have been renamed or reworked in the https://github.com/Pometry/Raphtory/pull/2249/files PR so any feedback to align these would be helpful