Decide and scaffold the documentation site search

[Spark450]

To be worked on by @chrisolsen

Summary

Pick a search tech stack and create the initial scaffolding that supports search as a core capability

Latest designs for workspace (Oct 24 2025)

Objectives

• Compare approaches and make a decision.
• Record the decision in this issue.
• Stand up a working repo with an example page.

Scope

• Select a search framework (e.g. Lunr.js)

Acceptance criteria

• [ ] Chosen approach selected and reasons given.
• [ ] Search framework selected and working in Netlify deploy preview link.

[Spark450]

As discussed with @chrisolsen adjusting issue scope to be focused only on search and reducing the priority