FIX: Short term fix for ipywidgets

[mmcky]

This PR is a short term fix to improve outputs in lectures that use ipywidgets.

• matsuyama
• black_litterman

This edits the lecture to show what the output should look like (with default values) and then leaves mybinder for the interactive plot. This is added as comments to the code with a link to the tracking issue to support richer ipywidgets in the html if possible as a future project.

[mmcky]

@jstac this is my proposal for ipywidgets in the short/medium term -- let me know what you think when you have time. thanks!

[mmcky]

ipywidgets are actually breaking the website rendering as it injects javascript that doesn't run properly and so javascript halts rendering of the site.

• I think we need to add interact to a :tags: ["remove-output"] code-cell and leave it to run in binder and local settings (for download notebooks). This will test that the cell executes but will remove any failed javascript objects

[mmcky]

• merged these changes into fix-codefromfiles branch to fix rendering issues when building with execution switched on

If there are no further changes this won't need to be merged. otherwise I can update this PR and then merge in those changes to fix-codefromfiles

[mmcky]

• check for other instances of interact in the lectures as there are still javascript objects added

[mmcky]

@AakashGfude I can confirm if we remove the output from any code-cell that uses interact the theme is rendered in full if that helps with your debugging for quantecon-book-theme

In the short term I think we can accept removing this output and adding in static versions of the code-cell items and leaving the interact versions to mybinder and download notebooks

[mmcky]

This will be merged via #4

[mmcky]

support has been added to the theme. So not considering adjustments at this stage as the default figure shows on the html website.