docs: add swagger ui in docs

[julienrbrt]

Description

Closes: #15112
ref: #15209 (comment)

Note: there is no endpoint to query behind, as it will be the same swagger that there are on nodes, but on GH Pages (where our docs is deployed).

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[tac0turtle]

as long as we document that a user can input an endpoint that works

[julienrbrt]

as long as we document that a user can input an endpoint that works

Unfortunately, not presently. It does not seem like you can let an user input a host url (https://swagger.io/docs/specification/2-0/api-host-and-base-path/).
It seems like it needs to be defined in the swagger.yaml.

EDIT: NVM, we can always use the url to set another endpoint.