Formatting changes to README

[shuds13]

Following display issues with README (a known issue)

• Badges each on own line.
• Code blocks render incorrectly.

This will likely resolve itself, but experimenting with use of substitutions for badges. Is it safe to then move details to bottom (despite after_badges_rst_tag).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.98%. Comparing base (125884e) to head (a293b1f).
Report is 19 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1278      +/-   ##
===========================================
- Coverage    73.08%   72.98%   -0.11%     
===========================================
  Files           90       90              
  Lines         8233     8243      +10     
  Branches      1472     1476       +4     
===========================================
- Hits          6017     6016       -1     
- Misses        1982     1989       +7     
- Partials       234      238       +4     

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[jmlarson1]

I see no difference in the latexpdf builds on develop or this branch with these changes.

[jmlarson1]

After the latest changes and merge.... I see no difference in the latexpdf builds on develop or this branch with these changes.