Make version on docs visually distinct from package name

[dahlia]

A picture is worth a thousand words:

[codecov]

Codecov Report

Merging #312 into master will decrease coverage by 0.05%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #312      +/-   ##
==========================================
- Coverage   76.22%   76.17%   -0.06%     
==========================================
  Files          34       34              
  Lines        2902     2904       +2     
  Branches      194      194              
==========================================
  Hits         2212     2212              
- Misses        496      498       +2     
  Partials      194      194

Impacted Files	Coverage Δ
src/Nirum/Targets/Docs.hs	47.64% <0%> (-0.51%)	⬇️

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