Remove codeowners and update install instructions

[gwaybio]

Description

• Removing CODEOWNERS file as discussed in Add github action to publish to pypi #188 (comment)
• Updating install instructions in RTD
  • Note that before merging, we need to wait on conda-forge/staged-recipe#17976 for the conda install instructions to work

What is the nature of your change?

• Bug fix (fixes an issue).
• Enhancement (adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• This change requires a documentation update.

Checklist

Please ensure that all boxes are checked before indicating that a pull request is ready for review.

• I have read the CONTRIBUTING.md guidelines.
• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• New and existing unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have deleted all non-relevant text in this pull request template.

[codecov-commenter]

Codecov Report

Merging #190 (81aefb0) into master (ea3340c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #190   +/-   ##
=======================================
  Coverage   98.04%   98.04%           
=======================================
  Files          50       50           
  Lines        2403     2403           
=======================================
  Hits         2356     2356           
  Misses         47       47           

Flag	Coverage Δ
unittests	98.04% <ø> (ø)

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[gwaybio]

both install methods now work :)