PLANET-5682 Investigate implementing the Search page in React

[planet-4]

This could be built as a Proof of Concept to assess its feasibility.

Tasks

• Investigate feasibility on Reach re-implementation.
• Check if [Elasticpress React|https://github.com/10up/elasticpress-react] is something we can use.
• Can we interact directly with ElasticSearch?

Reporter: nroussos
Sections: Search

Potentially affected repositories: planet4-master-theme