Deploy both Internal and Production website to S3 and serve using CloudFront

[nirmalsunny]

Deploy the website to new Internal and Production S3 buckets. These can then be served using CloudFront. I have modified the workflows to allow deployment to these buckets while retaining the current deployment mechanisms. (S3 for internal and Akamai for production) My plan is to have two instances per environment so that the DNS can be switched without downtime.

Changes:

• Added new targets to the Hugo config to select where it should deploy to.
• Created a reusable workflow to be called from main and production workflows (To deploy to S3)
• AWS authentication uses OIDC instead of hard-coded secrets (More secure - https://docs.github.com/en/actions/security-for-github-actions/security-hardening-your-deployments/configuring-openid-connect-in-cloud-providers)
• Added a generic error page to return for something like 403.
• Renamed the 'deploy.yml' to 'production.yml' and 'deploy.yml' is the reusable workflow now.