Remove lint and docs targets from tox envlist

[jadchaar]

Pull Request Checklist

Thank you for taking the time to improve Arrow! Before submitting your pull request, please check all appropriate boxes:

• [ ] 🧪 Added tests for changed code.
• [x] 🛠️ All tests pass when run locally (run tox or make test to find out!).
• [x] 🧹 All linting checks pass when run locally (run tox -e lint or make lint to find out!).
• [ ] 📚 Updated documentation for changed code.
• [x] ⏩ Code is up-to-date with the master branch.

If you have any questions about your code changes or any of the points above, please submit your questions along with the pull request and we will try our best to help!

Description of Changes

Removes lint and docs targets from the tox envlist. This will allow folks to run all tests on the distribution tarball using tox with a simple tox command. Our linting suite requires pre-commit, which fails outside of a git repository, so it is probably best to leave out the linting related targets and instead invoke them manually via tox -e lint and tox -e docs.

Closes: https://github.com/arrow-py/arrow/issues/864 Closes: https://github.com/arrow-py/arrow/issues/869

[codecov[bot]]

Codecov Report

Merging #870 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #870   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines         1809      1809           
  Branches       312       312           
=========================================
  Hits          1809      1809           

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