fix client rendering issues

[fscherf]

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This PR replaces the old client pre compiler infrastructure with Javascript ES06 imports and, and fixes multiple rendering issues reported by @SmithChart

[codecov-commenter]

Codecov Report

Merging #232 (318312f) into master (754d4e9) will decrease coverage by 0.11%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #232      +/-   ##
==========================================
- Coverage   62.24%   62.13%   -0.12%     
==========================================
  Files          67       66       -1     
  Lines        4818     4772      -46     
  Branches      932      924       -8     
==========================================
- Hits         2999     2965      -34     
+ Misses       1566     1559       -7     
+ Partials      253      248       -5     

Impacted Files	Coverage Δ
lona/server.py	67.49% <ø> (+0.10%)	:arrow_up:
lona/protocol.py	69.04% <100.00%> (+2.09%)	:arrow_up:
lona/static_file_loader.py	79.27% <100.00%> (+1.20%)	:arrow_up:
lona/templating.py	83.95% <100.00%> (+2.86%)	:arrow_up:

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[SmithChart]

Fixes the behavior of my reproducer in #231 . Thx

[fscherf]

@SmithChart: Thanks for reporting and testing!