Add Swagger API page

[akshaygin]

Swagger is great way to document, test and consume RESTful Paralus APIs. Let's add the swagger UI page to paralus.io site.

Generated OpenAPI specification available here: https://github.com/paralus/paralus/tree/main/gen/openapi

[akshaygin]

An example: https://www.ory.sh/docs/reference/api

[nirav-rafay]

Few frameworks / examples that work well with docusaurus and openapi specs

GHRepo: https://github.com/PaloAltoNetworks/docusaurus-openapi-docs
Demo Site: https://docusaurus-openapi.tryingpan.dev/