doc: Update Helm Installation Command

[badal773]

Description:
Refine the Helm installation process to ensure the latest version is installed, addressing an issue where an older version might be installed if the Helm repo is not updated. This modification includes adding the helm repo update command to refresh the repository before installation.

Changes:

• Previously: Helm repo was added, and installation was performed directly.
• Updated: Added helm repo update devtron command to ensure the latest version is fetched before installation.

helm repo add devtron https://helm.devtron.ai

helm repo update devtron

helm install devtron devtron/devtron-operator --create-namespace --namespace devtroncd \
--set installer.modules={cicd}

Additionally, the documentation now highlights the use of the --reuse-values flag during the helm upgrade command. This flag is essential for maintaining consistent configuration values without requiring explicit redefinition during upgrades.

[sonarcloud]

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