MAINT: Update quantecon-book-theme==0.6.0

[mmcky]

This PR tests the new refactor of the quantecon-book-theme

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[mmcky]

@AakashGfude I am getting some missing icons still on the exercise directive. Any ideas?

[mmcky]

@AakashGfude I am getting some missing icons still on the exercise directive. Any ideas?

@AakashGfude I just updated to the PyPI release and the icon issue is fixed. Sorry to bug you unnecessarily.

[HumphreyYang]

Many thanks @AakashGfude and @mmcky,

This looks great! The dark mode is really cool.

I spotted some very minor corner cases that might be improved:

1. For Pandas tables (i.e. the one in long_run_growth) lecture has dark rows that are less visible:

2. The import code is grey, so it looks very similar to the background color, i.e.:

3. Based on my observations, I think graphs are restyled under dark mode (this looks really cool!), but there are some plots that are not in the dark mode (for example, the ones in the inequality lecture)

4. The exercise title is slightly harder to see:
   

5. In Eigenvalues lecture, one of the formulae with special annotations is still in black:

Many thanks in advance.

[AakashGfude]

Thanks @HumphreyYang for analysing it so nicely. I will do the fixes and create a PR.

[mmcky]

thanks @HumphreyYang this is a big help.

@AakashGfude thanks for your work on this refactor. I think I will make the switch to quantecon-book-theme==0.6.0 across all the lecture sites.

[AakashGfude]

Thanks @mmcky