Switch to unmanaged layout in ReactiveHTML

[philippjfr]

ReactiveHTML now no longer applies the position and sizing computed by the bokeh layout manager instead relying on pure CSS layouts.

[codecov]

Codecov Report

Merging #2401 (c53412c) into master (7be79e8) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2401      +/-   ##
==========================================
- Coverage   83.54%   83.53%   -0.01%     
==========================================
  Files         185      185              
  Lines       22635    22634       -1     
==========================================
- Hits        18910    18908       -2     
- Misses       3725     3726       +1     

Impacted Files	Coverage Δ
panel/io/reload.py	64.36% <0.00%> (-2.30%)	⬇️
panel/pane/idom.py	27.40% <0.00%> (+0.20%)	⬆️

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