docs: Improve badge layout and fix broken Docker badge

[matthewfeickert]

Description

Resolves #1361

The old Docker deployment badge is now broken,

so fix it by using the GitHub Actions stats badge. Also reorder badges for user convince over developer convenience.

Current layout

PR layout

@phinate we'll merge this before you can probably look at it, but feedback and future revision suggestions are welcome.

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* Update broken Docker deployment badge with GitHub Actions Docker workflow status badge
* Remove Docker stars and pulls badges
* Add pyhf CUDA enabled Docker images badge
* Revise badge layout to prioritize user needs (docs and distributions) over developer interests (code quality and CI status)

[codecov]

Codecov Report

Merging #1497 (20ec345) into master (ccc32c1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1497   +/-   ##
=======================================
  Coverage   97.65%   97.65%           
=======================================
  Files          63       63           
  Lines        4006     4006           
  Branches      565      565           
=======================================
  Hits         3912     3912           
  Misses         55       55           
  Partials       39       39           

Flag	Coverage Δ
contrib	25.51% <ø> (ø)
unittests	97.42% <ø> (ø)

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