Fix docs build and URLs

[Archmonger]

Looks like PR #414 broke our docs build. This PR fixes that, and cleans up the URLs within the docs.

[codecov]

Codecov Report

Merging #437 (2ead2a0) into master (246c1dd) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #437      +/-   ##
==========================================
+ Coverage   90.87%   90.94%   +0.06%     
==========================================
  Files          19       19              
  Lines         855      861       +6     
  Branches      173      173              
==========================================
+ Hits          777      783       +6     
  Misses         42       42              
  Partials       36       36              

Impacted Files	Coverage Δ
dbbackup/__init__.py	75.00% <100.00%> (+75.00%)	⬆️

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[johnthagen]

@Archmonger Sorta related to this, should we add a pyproject.toml for this project to properly specify build-time dependencies?

• https://pip.pypa.io/en/stable/reference/build-system/pyproject-toml/

[Archmonger]

I think pyproject.toml belongs in #438 so I'll merge this as is