website: Add link to CLI docs.

Signed-off-by: Blaž Hrastnik <blaz.hrast@gmail.com>
cli, website: Pretty-print help JSON.

Signed-off-by: Blaž Hrastnik <blaz.hrast@gmail.com>
website: Add table styles, fix table alignment

Signed-off-by: Blaž Hrastnik <blaz.hrast@gmail.com>