Only package files needed for building and testing

[pitdicker]

Compared to what we packaged before we now skip those files:

.git-ignore-revs
.github/codecov.yml
.github/dependabot.yml
.github/pull_request_template.md
.github/workflows/codecov.yml
.github/workflows/lint.yml
.github/workflows/test.yml
.gitignore
CHANGELOG.md
CITATION.cff
deny.toml
rustfmt.toml
taplo.toml

Also we had a leftover appveyor.yml file. Not sure why it was not deleted outright in #436.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.78%. Comparing base (8b1364f) to head (24e0e5e).

❗ Current head 24e0e5e differs from pull request most recent head 857a9d3. Consider uploading reports for the commit 857a9d3 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1554   +/-   ##
=======================================
  Coverage   91.78%   91.78%           
=======================================
  Files          37       37           
  Lines       18167    18167           
=======================================
  Hits        16674    16674           
  Misses       1493     1493           

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[djc]

I think we should maybe ship CITATION.cff? Not sure how that gets used but I can see how that might be useful.