Link to installation instructions

[simonw]

Also testing https://docs.readthedocs.io/en/stable/pull-requests.html

[codecov]

Codecov Report

Merging #457 (80b3907) into main (9e6ccea) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #457   +/-   ##
=======================================
  Coverage   96.64%   96.64%           
=======================================
  Files           6        6           
  Lines        2566     2566           
=======================================
  Hits         2480     2480           
  Misses         86       86           

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[simonw]

Here's the build from the PR: https://sqlite-utils--457.org.readthedocs.build/en/457/