Installation guides

[drazendee]

• [x] Publish the howto/setup section
• [x] Update the setup guides to promote CF/TF templates
• [x] Refresh the AWS/GCP manual guides to be inline with the templates
• [x] Include a new addon for the "details" directive
• [x] Add a simple example on how to connect to BigQuery

[orasimus]

LGTM, please check my changes @DrazenDodik