Jupyter-book: Warnings: `extra_navbar` and `extra_footer`

[spring-haru]

Describe the bug
Updated to 0.7.0b4, and get the following warning messages

WARNING: unsupported theme option 'extra_navbar' given
WARNING: unsupported theme option 'extra_footer' given

To Reproduce
Steps to reproduce the behavior:

1. jb clean . --all or jb clean .
2. 'jb build .'

Expected behavior
no such warning messages

A link to your book's repository.

https://haruyama-kobeu.github.io/book_etrics/docs/index.html
Environment (please complete the following information):

• Python Version: 3.8.2
• Output of jupyter-book --version : 0.7.0b4

[choldgraf]

I think this is an issue with jupyter-book not explicitly needing a minimum version of the sphinx-book-theme. I'm tracking that in #675 , but in the meantime could you upgrade sphinx-book-theme and see if this solves the issue?

[nathancarter]

Confirming: I had the same issue and upgrading sphinx-book-theme (in my case from 0.0.16 to 0.0.23) fixed the issue.

[amueller]

I'm running into this again, master has "sphinx_book_theme~=0.0","

[choldgraf]

is the "this" the issue of the book theme not upgrading?

[amueller]

It's getting a extra_navbar and extra_footer warning because an old version of sphinx-book-theme is being installed.