git repo: rename `examples` to `templates` (will break existing hyperlinks)

[AkihiroSuda]

https://github.com/lima-vm/lima/tree/master/examples

This will break existing hyperlinks, but probably acceptable in v1.0

[afbjorklund]

Some of the examples are broken anyway, so any users of older releases will need to use older versions of the links.

https://github.com/lima-vm/lima/tree/v0.23.2/examples

i.e. not everything on master is compatible with old limactl

FATA[0002] the YAML is invalid, saved the buffer as "lima.REJECTED.yaml": riscv64 needs the kernel (e.g., "uboot.elf") to be specified