docs(api): make API version dynamic

[erictleung]

Overview

This commit replaces the hard-coded version number with a variable in the reStructuredText-rendered documentation landing page.

Test Plan

N/A (only touches documentation and I mirrored the format for the OT-2 tab from the Flex tab)

Changelog

• Replace hard-coded version in docs with reStructuredText variable

Review requests

N/A

Risk assessment

Low risk

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (13e2c40) 68.06% compared to head (852aba1) 68.06%.

Additional details and impacted files

@@           Coverage Diff           @@
##             edge   #14268   +/-   ##
=======================================
  Coverage   68.06%   68.06%           
=======================================
  Files        2508     2508           
  Lines       71333    71333           
  Branches     9060     9060           
=======================================
  Hits        48556    48556           
  Misses      20674    20674           
  Partials     2103     2103           

Flag	Coverage Δ
g-code-testing	96.44% <ø> (ø)
notify-server	89.13% <ø> (ø)

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[SyntaxColoring]

Thanks for the correction!