Guess at how to fix up user guide's Deploying Bokeh Apps

[ceball]

Since #4108 was merged, and given existing comments on this PR, I removed #4108's changes from here and made this PR be just about fixing the error in 'Deploying Bokeh Apps':

pytest -v --nbsmoke-lint examples
=========================================================================== test session starts ===========================================================================
platform linux -- Python 3.7.3, pytest-5.2.2, py-1.8.0, pluggy-0.13.0 -- /home/sefkw/mc3/envs/miscdev37/bin/python
cachedir: .pytest_cache
metadata: {'Python': '3.7.3', 'Platform': 'Linux-5.3.0-18-generic-x86_64-with-debian-buster-sid', 'Packages': {'pytest': '5.2.2', 'py': '1.8.0', 'pluggy': '0.13.0'}, 'Plugins': {'html': '2.0.0', 'nbsmoke': '0.3.0', 'metadata': '1.8.0', 'cov': '2.8.1', 'nbval': '0.9.3'}}
rootdir: /home/sefkw/code/holoviz/holoviews
plugins: html-2.0.0, nbsmoke-0.3.0, metadata-1.8.0, cov-2.8.1, nbval-0.9.3
[...]
examples/user_guide/Deploying_Bokeh_Apps.ipynb::/home/sefkw/code/holoviz/holoviews/examples/user_guide/Deploying_Bokeh_Apps.ipynb FAILED                            [ 96%]
[...]
______________________________________________________________________________ test session _______________________________________________________________________________
/home/sefkw/code/holoviz/holoviews/examples/user_guide/Deploying_Bokeh_Apps.ipynb
** line 117 col 27: undefined name 'layout'
** line 151 col 9: undefined name 'layout'
** line 164 col 26: undefined name 'layout'
** line 325 col 0: 'bokeh.io.curdoc' imported but unused
To see python source that was checked by pyflakes: /home/sefkw/code/holoviz/holoviews/examples/user_guide/Deploying_Bokeh_Apps.nbsmoke-debug-postmagicprocess.py
To see python source before magics were handled by nbsmoke: /home/sefkw/code/holoviz/holoviews/examples/user_guide/Deploying_Bokeh_Apps.nbsmoke-debug-premagicprocess.py

I have no idea what was supposed to be there, though :)

[jbednar]

@jlstevens , it looks to me like layout is indeed undefined on the first run through the Deploying_Bokeh_Apps.ipynb notebook; do you have any idea what happened? How has it ever worked?

[jbednar]

It looks like bokeh.io.curdoc is used in commented-out code, and so should be marked #noqa

[philippjfr]

Sorry this never got merged but since this was added I overhauled that notebook significantly.

[github-actions]

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