[PR-23781] Migrate docs to Jenkins

[en-ver]

Brand new documentation deployment approach:

• Dockerized deployment
• Hosted on Amazon AWS VPS
• Automated deployments using Jenkins
• New responsive mobile friendly theme (furo)
• New url structure https://docs.talkable.com/file.html -> https://docs.talkable.com/file/
• URL backward compatibility:
  • any urls ending with /path/index.html to be redirected to /path/
  • all other urls ending with /path/file.html to be redirected to /path/file/
• one-step local/development environment deployment (docker-compose up -d)
• dynamic robots.txt for different environments
• dynamic sitemap baseurl and canonical urls for different environments

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[zhuravel]

I’ve cleaned up the CI config a bit, see last commit. LG now.