update website readme (#8739)
update website readme (#8739)

- add section on redirects
- add section on markdown enhancements
- consistently wrap at col 81
- add fix for safe write issue
rnaveiras/vault,rnaveiras/vault,rnaveiras/vault,hartsock/vault,rnaveiras/vault,hartsock/vault,hartsock/vault,hashicorp/vault,rnaveiras/vault,hashicorp/vault,hartsock/vault,hashicorp/vault,hartsock/vault,hashicorp/vault,hashicorp/vault,hashicorp/vault