docs: how to enable optional components

[mendonk]

This pull request improves the documentation for Pulsar cluster components by making the component links clearer and adding instructions for enabling optional components using Helm chart values.

Improvements to documentation clarity:

• Updated the formatting of required and optional component links in the Pulsar cluster overview by moving the link target outside the brackets, making the links easier to read and click.

Enhancements to usage instructions:

• Added a new section explaining how to enable optional components (like Pulsar Admin Console) in the Helm chart by modifying the values.yaml file, including a YAML configuration example.

[plpesvc-ds]

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