K8SPS-583 Fixed monitoring and TLS docs, added hidden draft for monitor kubernetes doc

[nastena1606]

    modified:   docs/System-Requirements.md
    modified:   docs/TLS.md
    modified:   docs/architecture.md
    modified:   docs/assets/fragments/monitor-db.txt
    new file:   docs/assets/images/cadvisor.svg
    new file:   docs/assets/images/certificates.svg
    new file:   docs/assets/images/kubelet.svg
    modified:   docs/cluster-wide.md
    modified:   docs/data-insert.md
    modified:   docs/index.md
    new file:   docs/monitor-kubernetes.md
    modified:   docs/operator.md
    new file:   docs/tls-update.md
    modified:   mkdocs-base.yml
    deleted:    snippets/monitor-db.md
    modified:   variables.yml

[Copilot]

Pull Request Overview

This PR consolidates and improves TLS and monitoring documentation. The main changes restructure the monitoring documentation by moving content from a snippet file to a reusable fragment, add a new draft document for Kubernetes monitoring, and enhance TLS documentation with clearer instructions for certificate management and updates.

Key changes:

• Restructured monitoring documentation by converting snippets to fragments and adding a new Kubernetes monitoring guide
• Enhanced TLS documentation with improved certificate generation instructions and a new certificate update guide
• Fixed formatting inconsistencies and typos across multiple documentation files

Reviewed Changes

Copilot reviewed 16 out of 19 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
variables.yml	Added monitoring tag variable for Kubernetes monitoring stack version
snippets/monitor-db.md	Removed - content migrated to fragments
mkdocs-base.yml	Fixed commented navigation entry for Kubernetes monitoring page
docs/tls-update.md	New guide for certificate expiration checking and updates
docs/monitor-kubernetes.md	New comprehensive guide for Kubernetes cluster monitoring with PMM
docs/TLS.md	Restructured with improved certificate generation workflow and prerequisites
docs/assets/fragments/monitor-db.txt	Updated with clearer PMM setup instructions and token format
docs/encryption-setup.md	Fixed formatting inconsistencies in code blocks
docs/data-insert.md	Fixed broken internal link
docs/System-Requirements.md	Added OpenShift installation option
docs/cluster-wide.md	Added external link indicators
docs/ReleaseNotes/*	Removed external link indicators from internal GitHub links
docs/*-tutorial.md	Fixed heading formatting

Comments suppressed due to low confidence (1)

docs/tls-update.md:1

• Broken internal link anchor - the reference '#' points nowhere and should link to the 'Check your certificates for expiration' section.

## Update certificates

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[nmarukovich]

in this case the command will be wrong and didn't apply, since in NAMESPACE variable we store vault, not operator ns.

[egegunes]

there's no internal and external in PS operator. there's a single certificate