Show complete rows on pages by default.

[joaander]

Description

Set PER_PAGE to 24.

Motivation and Context

With the default cards per row of 3, this makes the default view show complete rows to the end of the page. Prior to this change, the last row is left incomplete because 25 is not an integer multiple of 3.

Checklist:

• I am familiar with the Contributing Guidelines.
• I agree with the terms of the Contributor Agreement.
• The changes introduced by this pull request are covered by existing or newly introduced tests.
• The package documentation and framework documentation in signac-docs are up to date with these changes.
• I have updated the changelog and added any related issue and pull request numbers for future reference.

[codecov]

Codecov Report

Merging #168 (85cede9) into master (7c7a696) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 85cede9 differs from pull request most recent head 5882493. Consider uploading reports for the commit 5882493 to get more accurate results

@@           Coverage Diff           @@
##           master     #168   +/-   ##
=======================================
  Coverage   73.32%   73.32%           
=======================================
  Files          20       20           
  Lines         791      791           
=======================================
  Hits          580      580           
  Misses        211      211           

Impacted Files	Coverage Δ
signac_dashboard/dashboard.py	72.75% <100.00%> (ø)

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[bdice]

The original motivation for 25 was that a number around 25 felt like a reasonable size for the page, and I liked that 4 pages = 100 jobs. I don't have a strong feeling about this and if users find it compelling to have 24 instead, that is fine.

[joaander]

Users can change the setting. I just though others might find the default behavior annoying:

So much white space!