Caching update

[georgimld]

• remove the redis caching we have now and only enable graph ql caching with apollo -> docs here and here

• rewrite some postgres queries so that they're more efficient and there's no need for caching

• integrate mapper functions into service functions, remove existing mappers and requests in mappers

• multiple strapi requests should be done via one single graphql request where possible, e.g. screenshot below:

  

• explore syncing users between strapi and db to make db queries faster

• fulltext search combined strapi + postgres

  • in strapi - https://www.meilisearch.com/
  • fulltext search in postgres -> also using meilisearch?