<p>This PR fixes a few CSS issues that were highlighted in <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="544921740" data-permission-text="Issue title is private" data-url="https://github.com/openstreetmap/openstreetmap-website/issues/2492" data-hovercard-type="issue" data-hovercard-url="/openstreetmap/openstreetmap-website/issues/2492/hovercard" href="https://github.com/openstreetmap/openstreetmap-website/issues/2492">#2492</a> and others that I noticed while working on that. In summary:</p>
<ul>
<li>Uses bootstrap's list-group-flush to replace custom css, for sidebars with lists-with-lines-between</li>
<li>Uses h6 for the changeset comment tag text</li>
<li>Removes some unnecessary custom css rules</li>
<li>Tweaks the rss icon to line it up with other icons</li>
</ul>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/openstreetmap/openstreetmap-website/pull/2497'>https://github.com/openstreetmap/openstreetmap-website/pull/2497</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Refactor the query results to use bootstrap list-group-flush</li>
  <li>Remove font size override on sidebar tags tables</li>
  <li>Rework changeset descriptions to use h6 tags, and refactor changeset lists to use list-group-flush</li>
  <li>Remove extra styling for rss icon</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2497/files#diff-0">app/assets/javascripts/index/query.js</a>
    (8)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2497/files#diff-1">app/assets/stylesheets/_bootstrap-custom.scss</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2497/files#diff-2">app/assets/stylesheets/common.scss</a>
    (30)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2497/files#diff-3">app/views/browse/changeset.html.erb</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2497/files#diff-4">app/views/browse/query.html.erb</a>
    (8)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2497/files#diff-5">app/views/changesets/_changeset.html.erb</a>
    (8)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2497/files#diff-6">app/views/changesets/index.html.erb</a>
    (2)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/2497.patch'>https://github.com/openstreetmap/openstreetmap-website/pull/2497.patch</a></li>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/2497.diff'>https://github.com/openstreetmap/openstreetmap-website/pull/2497.diff</a></li>
</ul>

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