docs(installation): Add mirror

[zsnmwy]

What type of PR is this?

mirror

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=== "Main"

    ```bash
    helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
    helm install prometheus -n crane-system \
                            --set pushgateway.enabled=false \
                            --set alertmanager.enabled=false \
                            --set server.persistentVolume.enabled=false \
                            -f https://raw.githubusercontent.com/gocrane/helm-charts/main/integration/prometheus/override_values.yaml \
                            --create-namespace  prometheus-community/prometheus
    ```

=== "Mirror"

    ```bash
    helm repo add prometheus-community https://finops-helm.pkg.coding.net/gocrane/prometheus-community
    helm install prometheus -n crane-system \
                            --set pushgateway.enabled=false \
                            --set alertmanager.enabled=false \
                            --set server.persistentVolume.enabled=false \
                            -f https://finops.coding.net/p/gocrane/d/helm-charts/git/raw/main/integration/prometheus/override_values.yaml?download=false \
                            --create-namespace  prometheus-community/prometheus
    ```

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♻️ PR Preview dd3f16f has been successfully destroyed since this PR has been closed.

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[qmhu]

It will be cleaner to introduce mirror in a separate section, you can explain how to change a cmd into a used mirror cmd by an example. We don't need to explain it for every cmd

[github-actions]

🎉 Successfully Build Images.

Overview: https://finops.coding.net/public-artifacts/gocrane/crane/packages

Image	Pull Command
crane-agent:pr-274-0507619	docker pull finops-docker.pkg.coding.net/gocrane/crane/crane-agent:pr-274-0507619
dashboard:pr-274-0507619	docker pull finops-docker.pkg.coding.net/gocrane/crane/dashboard:pr-274-0507619
metric-adapter:pr-274-0507619	docker pull finops-docker.pkg.coding.net/gocrane/crane/metric-adapter:pr-274-0507619
craned:pr-274-0507619	docker pull finops-docker.pkg.coding.net/gocrane/crane/craned:pr-274-0507619

[qmhu]

/LGTM