Fix/dynamic assignment

[jaywhj]

• Supports dynamic assignment for img src (values assigned to src in JavaScript can also be rendered)
• Compatible with the MaterialX theme
• Compatible with the instant loading property navigation.instant
• Supports Jinja templates (img in blog or other Jinja templates can also be rendered)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (036d066) to head (f5f9ac9).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #70   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          117       108    -9     
=========================================
- Hits           117       108    -9     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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