✨ NEW: private input field for jupyterlab

[AakashGfude]

UPDATE : Description is updated after merging @DrDrij 's work in this PR: https://github.com/QuantEcon/quantecon-book-theme/pull/130

A private input field for hosting notebooks, the server can only be of jupyterlab at present :

example of a URL formed at the moment is:-

https://pims.syzygy.ca/jupyter/hub/user-redirect/git-pull?repo=https://github.com/QuantEcon/lecture-datascience.notebooks&urlpath=tree/lecture-datascience.notebooks/scientific/numpy_arrays.ipynbscientific/numpy_arrays.ipynb

when in the private window, the value entered is https://pims.syzygy.ca

When the private window is empty, the launch notebook button turns grey and inactive:

[codecov[bot]]

Codecov Report

Merging #129 (fb8fa0a) into master (305ec75) will increase coverage by 0.55%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #129      +/-   ##
==========================================
+ Coverage   71.73%   72.29%   +0.55%     
==========================================
  Files           2        2              
  Lines         230      231       +1     
==========================================
+ Hits          165      167       +2     
+ Misses         65       64       -1     

Flag	Coverage Δ
pytests	72.29% <100.00%> (+0.55%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
quantecon_book_theme/launch.py	90.69% <100.00%> (+1.28%)	:arrow_up:

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[mmcky]

thanks @AakashGfude.

@DrDrij do you want to merge this into your work on combining these buttons together for execution environments? I'll let you manage if you want this merged before or after your work here.