Drf example fixtures

[n2ygk]

Description of the Change

I've always been uncomfortable with the drf_example sqlite3 db binary file:

drf_example: SQLite 3.x database, last written using SQLite version 3019003

which includes a few rows of sample data.

This PR replaces it with a fixture. This adds one step to getting-started but makes it much more clear what the sample data is (and easier to maintain) .

Checklist

• PR only contains one change (considered splitting up PR)
• unit-test added (no new code)
• documentation updated
• changelog entry added to CHANGELOG.md
• author name in AUTHORS

[mblayman]

I'd recommend using a JSON fixture instead of YAML to avoid the extra dependency on PyYAML for the example app. Otherwise, LGTM. 👍

[codecov-io]

Codecov Report

Merging #462 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #462   +/-   ##
=======================================
  Coverage   93.24%   93.24%           
=======================================
  Files          54       54           
  Lines        3123     3123           
=======================================
  Hits         2912     2912           
  Misses        211      211

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