docs(server): new docs site for ARFlow server

[FelixNgFender]

I replaced the static.yml CI action and the bash scripts used to build & copy the docs to the static website. We now run all of that on a GitHub runner with a new website.yml action.

Added docs for Protobuf schema, 1 action item left here though: the old message field in RegisterResponse has been changed in the Protobuf schema, but the change has not been reflected in the generated data access layer for the C# client.

message RegisterResponse {
    string uid = 1; // previously named `message`
}

Centralized all remaining bash scripts in python/ to Poetry scripts inside pyproject.toml.

Added docs for important packages & tools used in the server.

[YiqinZhao]

Thanks for the contribution, a few thoughts of mine:

• Why is the message field changed to uid? To align with DataFrameRequest?
• I don't think centralizing all bash script code to the pyproject.toml file is a good practice. The Python side code will be published to pypi as both a package and a CLI tool. The command defined in the pyproject.toml file will be exposed as CLI subcommand, for example: arflow serve. The scripts for executing example code shouldn't be added to there.

[YiqinZhao]

Added more comments

[YiqinZhao]

The changes look good now. Will merging this PR break the server? Because the uid field updates are not reflected on the Unity side.

[YiqinZhao]

LGTM