docs: improve version management and dropdown display

[neilime]

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[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (20e8381) 89.80% compared to head (0c3ebe1) 89.86%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #536      +/-   ##
============================================
+ Coverage     89.80%   89.86%   +0.05%     
- Complexity     1853     1859       +6     
============================================
  Files            94       95       +1     
  Lines          6446     6460      +14     
============================================
+ Hits           5789     5805      +16     
+ Misses          657      655       -2     

Files	Coverage Δ
...cumentation/Generator/BootstrapVersionResolver.php	100.00% <100.00%> (ø)
...ion/Generator/UsagePage/UsagePageFileGenerator.php	24.61% <0.00%> (ø)

... and 1 file with indirect coverage changes

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