docs: cleanup README; add link to chemrxiv

[byooooo]

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation

Actions (for code changes)

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-io]

Codecov Report

Merging #85 (7c66c46) into master (be43252) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #85   +/-   ##
=======================================
  Coverage   96.64%   96.64%           
=======================================
  Files          12       12           
  Lines         775      775           
=======================================
  Hits          749      749           
  Misses         26       26           

Flag	Coverage Δ
unittests	96.64% <ø> (ø)

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[kjappelbaum]

😆 we had #84

[kjappelbaum]

I will merge yours but we should also change it in the Sphinx

[byooooo]

haha oops! yea sorry. just saw your other PR!

[kjappelbaum]

the only thing that probably should be fixed is the "cann" -> "can". Thanks 👍

[byooooo]

include corrections before merge

[byooooo]

committed corrections to PR

[kjappelbaum]

lgtm, thanks 👍