Document the actions to deploy the docs site

[mkbreuningIOHK]

If you go to the tab 'Actions', there is no explanation to know what are the parameters and options to the deployment flow.

There are 2 parameters to the deployment flow:

• version
• environment

There is no guideline on what can be chosen for those two fields.

I propose that

• a guidance is added in the readme file.
• the help on the screen is modified from
  - 'Version to deploy, e.g. v1.0.0' to 'Docs version to deploy, e.g v1.76.1'
  - 'Environment to trigger update on' to 'Target environment: staging or production'

The source file is found here: https://github.com/input-output-hk/atala-prism-docs/blob/main/.github/workflows/deployment.yml

[essbante-io]

@mkbreuningIOHK is this still needed? I believe the deployment is documented in a .doc and moved to the handbook.

To deploy the documentation into production,
Find the portal version of the Documentation Portal from the latest atala-releases.md file.
In atala-prism-docs, run the workflow.
To deploy it, click the Run Workflow button and set the "version to deploy" with the portal version and set the "Environment to trigger update on" value to "production"
Click the green button.
To check if the right version was deployed, go to the public site, https://docs.atalaprism.io/, and check that the Agent API version is the one that is found in the atala-releases.md same file you used in the step 1.