Update links and text description

[NicolasMassart]

Signed-off-by: Nicolas MASSART nicolas.massart@consensys.net

Pull request checklist

Use the following list to make sure your PR fits the Besu documentation quality standard.

Before creating the pull request

Make sure that:

• All commits in this PR are signed off for the DCO.
• You've read the contribution guidelines.
• You've previewed your changes locally.

Describe the change

Update links and text description that were targetting dev or prod helm directories since both where merged in one helm dir.

Issue fixed

fixes #1027

Impacted parts

For content changes:

• Documentation content
• Documentation page organization

For tool changes:

• CircleCI workflow
• Build and QA tools (for example, lint or vale)
• MkDocs templates
• MkDocs configuration
• Python dependencies
• Node dependencies and JavaScript
• Read the Docs configuration
• GitHub integration

After creating your PR and tests have finished

Make sure that:

• You've fixed any issues raised by the tests.
• You've previewed your changes on Read the Docs
  and added a preview link.

Preview

• https://hyperledger-besu--1029.org.readthedocs.build/en/1029/Tutorials/Kubernetes/Deploy-Charts/
• https://hyperledger-besu--1029.org.readthedocs.build/en/1029/Tutorials/Kubernetes/Maintenance/
• https://hyperledger-besu--1029.org.readthedocs.build/en/1029/Tutorials/Kubernetes/Overview/
• https://hyperledger-besu--1029.org.readthedocs.build/en/1029/Tutorials/Kubernetes/Production/

[rolandtyler]

lgtm