fix[docs]: add html_static_path config

[hwhsu1231]

What I did

Add the missing config html_static_path in bc5d00a.

If html_static_path = ['_static'] is not specified, any logos placed in the _static subdirectory of the source directory will not be copied to the _static subdirectory under the build directory when building the HTML documentation. This will cause the following two theme option configurations to fail to find the _static/logo-dark|light.svg files:

html_theme_options = {
    "light_logo": "_static/logo-light.svg",
    "dark_logo": "_static/logo-dark.svg",
}

which will result in:

How I did it

Add the following configuration in conf.py file:

html_static_path = ["_static"]

How to verify it

uv run --group docs make -C docs html

Commit message

fix[docs]: add `html_static_path` config

Add the missing config `html_static_path` in bc5d00a

[hwhsu1231]

cc: @Sporarum @charles-cooper