fix: Fix issue with font scaling introduced in 3.0.0-alpha.6

[Sub6Resources]

Fixes #1170

I inadvertently used Text.rich, which doesn't handle accessibility or font scaling very well, instead of RichText in CssBoxWidget. This reverts that issue.

[codecov]

Codecov Report

Base: 51.41% // Head: 49.68% // Decreases project coverage by -1.73% ⚠️

Coverage data is based on head (1802309) compared to base (6571e3b).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 1802309 differs from pull request most recent head 1ed9643. Consider uploading reports for the commit 1ed9643 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1173      +/-   ##
==========================================
- Coverage   51.41%   49.68%   -1.74%     
==========================================
  Files          19       18       -1     
  Lines        2641     2681      +40     
==========================================
- Hits         1358     1332      -26     
- Misses       1283     1349      +66     

Impacted Files	Coverage Δ
lib/src/style/fontsize.dart	56.25% <ø> (ø)
lib/src/css_box_widget.dart	64.33% <100.00%> (+0.05%)	⬆️
lib/html_parser.dart	73.34% <0.00%> (-10.62%)	⬇️
lib/src/styled_element.dart	79.14% <0.00%> (-1.07%)	⬇️
lib/style.dart	84.77% <0.00%> (-0.60%)	⬇️
lib/src/css_parser.dart	13.64% <0.00%> (-0.20%)	⬇️
lib/src/style/marker.dart
lib/custom_render.dart	51.57% <0.00%> (+0.61%)	⬆️

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[erickok]

This is really unexpected to me... But glad it got fixed.

[kbosselmansh]

@Sub6Resources Is there a plan to push a new alpha release with this fix (3.0.0-alpha.7??)

[Sub6Resources]

@kbosselmansh Watch for 3.0.0-beta.1, coming hopefully before the end of the week.