feat: add R750 overrides and minor doc.

[sadsfae]

• Add rack overrides for another environment using Dell R750
• Minor doc fixup

[codecov-commenter]

Codecov Report

Merging #340 (a5618cb) into development (1d2046e) will increase coverage by 0.29%.
The diff coverage is 93.62%.

@@               Coverage Diff               @@
##           development     #340      +/-   ##
===============================================
+ Coverage        90.87%   91.17%   +0.29%     
===============================================
  Files                4        5       +1     
  Lines             1962     2164     +202     
===============================================
+ Hits              1783     1973     +190     
- Misses             179      191      +12     

Flag	Coverage Δ
unittests	91.17% <93.62%> (+0.29%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/badfish/main.py	95.21% <93.53%> (-0.15%)	⬇️
src/badfish/helpers/__init__.py	100.00% <100.00%> (ø)

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