Updated README on how to build/update documentation
Updated README on how to build/update documentation

gravitational/teleport,gravitational/teleport,gravitational/teleport,yacloud-io/teleport,yacloud-io/teleport,gravitational/teleport,gravitational/teleport,yacloud-io/teleport,gravitational/teleport,yacloud-io/teleport,yacloud-io/teleport,yacloud-io/teleport,yacloud-io/teleport