report: Use base64 images for HTML.

[daavoo]

Ensures the images work without CORS errors and inside Colab Notebooks.

I think the motivations for not using base64 in DVC were related to VSCode integration and they don't really apply here.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.02 ⚠️

Comparison is base (40fe282) 95.70% compared to head (e38fbd5) 95.68%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #508      +/-   ##
==========================================
- Coverage   95.70%   95.68%   -0.02%     
==========================================
  Files          41       41              
  Lines        2582     2573       -9     
  Branches      218      219       +1     
==========================================
- Hits         2471     2462       -9     
  Misses         66       66              
  Partials       45       45              

Impacted Files	Coverage Δ
tests/test_main.py	100.00% <ø> (ø)
src/dvclive/dvc.py	93.10% <100.00%> (-0.45%)	⬇️
src/dvclive/live.py	91.61% <100.00%> (+0.14%)	⬆️
src/dvclive/report.py	93.75% <100.00%> (+0.27%)	⬆️
tests/test_dvc.py	100.00% <100.00%> (ø)
tests/test_frameworks/test_lightning.py	97.82% <100.00%> (ø)
tests/test_report.py	100.00% <100.00%> (ø)
tests/test_studio.py	100.00% <100.00%> (ø)

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