fix dashboard helm release name conflict

[mikeee]

Renames the helm release to dapr-dashboard from dapr

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Description

Changes the documentation for deploying the dashboard using helm, notably only renaming the helm release name from dapr to dapr-dashboard to both prevent a release from being overwritten/updated.

Issue reference

Unreferenced issue - highlighted on discord.

[msfussell]

@mikeee - Is this the primary line you are addressing
helm install dapr-dashboard dapr/dapr-dashboard --namespace dapr-system
There is considerable formatting otherwise in this PR

[mikeee]

Removed any formatting changes other than the renamed argument

[msfussell]

LGTM. Thanks for the contribution