DOCS: Update windows instructions (#927)

docs/advanced/windows.md

@@ -6,65 +6,7 @@ Jupyter Book is now also tested against a Windows environment on Python 3.7 😀
 For its specification, see the [`windows-latest` runner](https://docs.github.com/en/actions/reference/virtual-environments-for-github-hosted-runners#supported-runners-and-hardware-resources) used by GitHub CI.
 
 However, there is a known incompatibility for notebook execution, when using Python 3.8
-(see issue [#906](https://github.com/executablebooks/jupyter-book/issues/906)).
+(see this jupyter issue: [jupyter/nbclient#85](https://github.com/jupyter/nbclient/issues/85))
 
-If you're running a recent version of Windows 10 and encounter any issues, you may also wish to try
+If you're running a recent version of Windows 10 and would like to build with Python 3.8 or encounter issues not covered in the tests, you may also wish to try
 [installing Windows Subsystem for Linux](https://docs.microsoft.com/en-us/windows/wsl/install-win10).
-
-As of June 5, 2020, there were three open issues that required Windows-specific changes.
-We hope these are now fixed in version 0.8 of Jupyter Book but, in case any issues still arise,
-we leave these community tips, which are known to work for some users.
-Note that there is no guarantee that they will work on all Windows installations.
-
-1. Character encoding
-
-    Jupyter Book currently reads and writes files on Windows in the native Windows
-    encoding, which causes encoding errors for some characters in UTF8 encoded
-    notebooks.
-
-    **Work-around:**  Beginning with
-    [Python 3.7](https://docs.python.org/3/using/cmdline.html#envvar-PYTHONUTF8)
-    cmd.exe or powershell enviroments that set PYTHONUTF8=1  override the native
-    locale encoding and use UTF8 for all input/output.
-
-    :::{tip}
-    To make it easier to use this option,
-    the EOAS/UBC notebook courseware project has created a Conda package [runjb](https://anaconda.org/eoas_ubc/runjb) which [does this automatically for powershell](https://github.com/eoas-ubc/eoas_tlef/blob/master/converted_docs/wintools/binwin/runjb.ps1)
-    :::
-
-2. A new Windows event loop
-
-   The asyncio event loop [has been changed for Python 3.8](https://github.com/sphinx-doc/sphinx/issues/7310)
-   causing sphinx-build to fail.
-
-   **Work-around:**  Pin to Python 3.7.6. This
-   [environment_win.yml](https://github.com/eoas-ubc/quantecon-mini-example/blob/windows/environment_win.yml)
-   file does that, and also installs runjb to fix issue 1.
-
-3. Nested tables of contents
-
-   Currently, `_toc.yml` files that reference Markdown files
-   in sub-folders are failing for some Windows users. That is, this
-   [original _toc.yml](https://github.com/eoas-ubc/quantecon-mini-example/blob/master/mini_book/_toc.yml)
-   file will fail with a message saying Jupyter Book "```cannot find index.md```"
-
-   **Work-around**: Flatten the layout of the book to a single level, i.e.
-   [this _toc.yml](https://github.com/eoas-ubc/quantecon-mini-example/blob/windows/mini_book/docs/_toc.yml)
-   file works with Windows.
-
-**Summary**
-
-The following workflow should succeed using a miniconda powershell terminal on Windows 10:
-
-1. `conda install git`
-2. `git clone https://github.com/eoas-ubc/quantecon-mini-example.git`
-3. `cd quantecon-mini-example`
-4. `git checkout windows`
-5. `conda env create -f environment_win.yml`
-6. `conda activate wintest`
-7. `cd mini_book`
-8. `runjb docs`
-
-After the build, view the HTML with:
-
-`start docs\_build\html\index.html`