add pre-commit hook to facilitate local testing (#9158)
* add pre-commit hook configuration
* add tmp.md to .gitignore
* describe the use of pre-commit hook in CONTRIBUTING.md
* fix docs/integration.md errors identified by markdownlint
* fix docs/<file>.md errors identified by markdownlint
* docs/azure-csi.md
* docs/azure.md
* docs/bootstrap-os.md
* docs/calico.md
* docs/debian.md
* docs/fcos.md
* docs/vagrant.md
* docs/gcp-lb.md
* docs/kubernetes-apps/registry.md
* docs/setting-up-your-first-cluster.md
* docs/vagrant.md
* docs/vars.md
* fix contrib/<file>.md errors identified by markdownlint
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Cristian Calin
Lubos Mercl