- Update and re-work the documentation:
  - Update links
  - Fix formatting (especially for lists)
  - Remove documentation about `useAlphaApi`,
    a flag only for k8s versions < v1.10
  - Attempt to clarify the doc
- Update to version 1.5.0
- Remove PodSecurityPolicy (deprecated in k8s v1.21+)
- Update ClusterRole following upstream
  (cf https://github.com/kubernetes-sigs/sig-storage-local-static-provisioner/pull/292)
- Add nodeSelector to DaemonSet (following upstream)

* 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

* Add registry replica setting

* Add registry liveness and readiness probe

* Set the security context for registry

* Add registry pvc access mode option

* registry add replica requirement check

* docs: add registry replicas setting note

* Update docs/kubernetes-apps/registry.md

Co-authored-by: Cristian Calin <6627509+cristicalin@users.noreply.github.com>

Co-authored-by: Cristian Calin <6627509+cristicalin@users.noreply.github.com>

* Docs: update sidebar

* Docs: move registry documentation into docs/

* Docs: move rbd_provisioner documentation into docs/

* Docs: move cephfs_provisioner into docs/

* Docs: move local_volume_provisioner documentation into docs/

* Docs: move ambassador.md to docs/ingress_controller/

* Docs: move metallb.md to docs/ingress_controller/

* Docs: move ingress_nginx documentation into docs/

* Docs: move alb_ingress_controller documentation into docs/

* Docs: merge ambassador documentation into docs/ingress_controller/

* Docs: move cert_manager documentation into docs/

* Docs: move bootstrap-os documentation into docs/

* Docs: update file locations in sidebar