Update README in preparation for version 1 release

[gwaybio]

Description

Reorganizing, rewording, and adding to README in preparation for version 1 release.

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.

[gwaybio]

Merging this PR will close #277

[codecov-commenter]

Codecov Report

Merging #289 (2b8df8b) into master (77d93a3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #289   +/-   ##
=======================================
  Coverage   95.12%   95.12%           
=======================================
  Files          57       57           
  Lines        3057     3057           
=======================================
  Hits         2908     2908           
  Misses        149      149           

Flag	Coverage Δ
unittests	95.12% <ø> (ø)

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[kenibrewer]

I'd recommend a few changes in the alternative installation instructions:

[gwaybio]

Thanks for the review @kenibrewer !

Are you able to approve the PR? It seems you went through thoroughly, so I am happy to merge after having your eyes on it.

[kenibrewer]

@gwaybio I approved the changes, but I don't count as a reviewer with write access. I assume you can probably merge anyways though.