Improve docs for 2.0 release

[Cadair]

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[codecov]

Codecov Report

Merging #102 (c38a428) into main (455002b) will decrease coverage by 0.14%.
The diff coverage is 100.00%.

❗ Current head c38a428 differs from pull request most recent head 21bee81. Consider uploading reports for the commit 21bee81 to get more accurate results

@@            Coverage Diff             @@
##             main     #102      +/-   ##
==========================================
- Coverage   93.40%   93.26%   -0.15%     
==========================================
  Files           5        5              
  Lines         546      549       +3     
==========================================
+ Hits          510      512       +2     
- Misses         36       37       +1     

Impacted Files	Coverage Δ
parfive/config.py	98.00% <100.00%> (-0.98%)	⬇️
parfive/main.py	100.00% <100.00%> (ø)

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