Remove Helm v2 usage from documentation
Summary
Remove all mentions of Helm v2 from our documentation, other than to say that it is unsupported as of 14.0, and the instructions on using helm 2to3.
Details
- advanced/external-mattermost/index.md
- advanced/geo/index.md
- advanced/persistent-volumes/index.md
- charts/gitlab/migrations/index.md
- development/deploy.md
- development/minikube/index.md
- index.md
- installation/deployment.md
- installation/index.md
- installation/migration/helm.md
- installation/tools.md
- installation/version_mappings.md
- releases/3_0.md
- releases/4_0.md
- troubleshooting/index.md