chore(doc): Notice that API and CLI doc is auto-generated

[gaocegege]

Description

https://github.com/tensorchord/envd-docs/pull/26

Users do not know which pages are auto-generated and which are manually written. We should add a header to the auto-generated doc.

cc @VoVAllen

[gaocegege]

cc @popfido

Sorry for the inconvenience

[popfido]

It doesn't matter. It's a great project for united ML environment configuration and I'd like to be its early user and contribute to its improvement!

[gaocegege]

I invited you as the contributor of envd to the org.

Please visit https://github.com/tensorchord to confirm. Thanks for the contribution.

[kemingy]

• closed by https://github.com/tensorchord/envd/pull/779