Docs: Add Data Export User Docs

[ChrisHuynh333]

What does this PR do and why?

This PR adds the user documentation for data exports

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other pull requests.

How to set up and validate locally

1. Start the docs in a terminal within your irida-next repo with:

   cd docs-site
   pnpm build
   npm run serve

2. Follow the exports documentation and see if it makes sense from a user's perspective.
3. Check that links navigate to the correct pages.

PR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• [x] I have evaluated the PR acceptance checklist for this PR.

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Simplecov Report

Covered	Threshold
92.36%	90%