As per the discussion in the March 11, 2021 etcd public meeting, we need to ensure that generated documentation gets merged into website automatically on update.

Related issues:

• etcd-io/website companion to this issue #111
• Etcd.io Docs/SEO Improvement Plan #65
• scripts/genproto.sh: updates needed scripts/genproto.sh: updates needed #13050

/cc @hexfusion, @ptabor, @spzala