Catalog in the docs (initial)

[hillaryfraley]

Description

Add catalog content in the Sensu docs.

Need at least a catalog page in the web UI category (https://docs.sensu.io/sensu-go/latest/web-ui/).

To be determined:

• Supported integrations sub-category: we could remove these pages. We can map over the individual integration readmes from sensu/catalog (e.g. https://github.com/sensu/catalog/tree/main/integrations/system/disk-monitoring) but maybe not right away. In any case, these individual integrations pages might not stay in the Plugins category.
• Sensu integrations section on the docs.sensu.io homepage: if we map the sensu/catalog readmes into the docs, these integration icons should link there.

Later, we might want to incorporate catalog into our guides -- either rewrite to replace the existing plugin-based workflows, add catalog as an option, or maybe both (add as an option once released; eventually rewrite).

Category

This is an issue with:

• errata (error in doc content)
• new doc (requires a completely new doc)
• update (add missing or refresh existing content)
• improvement (improve docs content or format)

Additional context

https://github.com/sensu/sensu-enterprise-go/issues/1992

Self-service marketplace for Sensu Go. Includes integrations for collection (checks) and connections (handlers).
Three elements: app (page in web UI); API (sensu/catalog-api); content (sensu/catalog).
API b/c we're hosting a centralized service instead of customers storing things on their own systems.
Customers can eventually host their own catalogs.
In sensu/catalog, the integration YAML files are usable examples of every Sensu resource you need for that integration.
People can also access catalog YAML files directly from the sensu/catalog repo, outside the Sensu web UI.

sensu/catalog#58

[hillaryfraley]

https://github.com/sensu/sensu-enterprise-go/issues/2094 (Sensu integration installer should prompt to update/replace existing resources)