fix: Restore responsive font sizes for rfc2html renderings

[larseggert]

@rjsparks this is the PR that I missed

[codecov]

Codecov Report

Merging #5136 (85da8b1) into main (e280b25) will increase coverage by 0.04%.
The diff coverage is 75.30%.

@@            Coverage Diff             @@
##             main    #5136      +/-   ##
==========================================
+ Coverage   88.50%   88.54%   +0.04%     
==========================================
  Files         295      295              
  Lines       40015    40006       -9     
==========================================
+ Hits        35415    35425      +10     
+ Misses       4600     4581      -19     

Impacted Files	Coverage Δ
ietf/doc/expire.py	95.31% <ø> (ø)
ietf/doc/views_ballot.py	92.86% <ø> (ø)
ietf/idindex/index.py	95.05% <ø> (ø)
ietf/ietfauth/utils.py	92.85% <ø> (ø)
ietf/ipr/utils.py	53.96% <0.00%> (ø)
ietf/meeting/views.py	90.70% <ø> (ø)
ietf/review/models.py	91.91% <ø> (ø)
ietf/stats/views.py	93.10% <ø> (ø)
ietf/utils/draft.py	71.75% <0.00%> (ø)
ietf/doc/views_draft.py	91.94% <25.00%> (ø)
... and 28 more

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