🐛 FIX: Some bug fixes

[AakashGfude]

Bug fixes reported in https://github.com/QuantEcon/lecture-datascience.myst/pull/83

• [x] Home button takes us to the global home page.
• [x] Images in the lectures under the theme contained inside the margins.
• [x] Correct font colors for dark mode.
• [x] \boldsymbol tex package inclusion in mathjax.

[codecov[bot]]

Codecov Report

Merging #118 (9725abb) into master (c3211f6) will increase coverage by 1.60%. The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master     #118      +/-   ##
==========================================
+ Coverage   70.12%   71.73%   +1.60%     
==========================================
  Files           2        2              
  Lines         231      230       -1     
==========================================
+ Hits          162      165       +3     
+ Misses         69       65       -4     

Flag	Coverage Δ
pytests	71.73% <85.71%> (+1.60%)	:arrow_up:

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

Impacted Files	Coverage Δ
quantecon_book_theme/__init__.py	61.37% <85.71%> (+2.47%)	:arrow_up:

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[mmcky]

thanks for reviewing @DrDrij