The style sheets are inconsistent

[llxxxll]

https://sql-machine-learning.github.io/pysqlflow/doc/desigin/magic_design_doc.html

https://sql-machine-learning.github.io/doc_index/doc

[wangkuiyi]

I confirm that the first two items "SQLFlow Client Design Doc" and "Magic Command Design Doc" are not in /_config.yaml. I don't know why they are there. I am not sure if it's the merge of my PR #39 caused this problem.

[mxz96102]

Doc should use doc layout to keep the style, edit it in _config.yaml, if need to ignore it in _config.yaml

defaults:
  - scope:
      path: "pysqlflow"
    values:
        layout: doc
        nav_exclude: true