Update theme to take advantage of new equal heights setting in localgov_base
>>> [!note] Migrated issue
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<!-- Migrated from issue #3591368. -->
Reported by: [markconroy](https://www.drupal.org/user/336910)
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>in <span class="drupalorg-gitlab-issue-link drupalorg-gitlab-link-wrapper"><a href="https://git.drupalcode.org/project/localgov_base/-/work_items/3574525" class="drupalorg-gitlab-link">https://git.drupalcode.org/project/localgov_base/-/work_items/3574525</a></span> we added the ability to set equal heights for blocks in layouts.</p>
<p>That means we can now remove our custom equal-heights.js and set our blocks via the theme settings.</p>
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