<p>This PR contains several CSS cleanups.</p>
<p>The main theme is continuing the work of disentangling the small screen stuff (which should be done with media breakpoints or builtin bootstrap functionality) from the navigation bar changes (which is based on the length of the text in the menus, not on the screen size).</p>
<p>Various other changes were found during this work too.</p>

<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/2709'>https://github.com/openstreetmap/openstreetmap-website/pull/2709</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Remove dead CSS code - nothing has the user_map class</li>
  <li>Rework the about header size change to be based on the screen width, not the menu state</li>
  <li>Remove webkit-appearance: none</li>
  <li>Move the login form rules to be based on screen size</li>
  <li>Rename nav-related body classes</li>
  <li>Use bootstrap backgrounds and text utilities for read issue reports</li>
  <li>Remove unused css</li>
  <li>Remove unnecessary css</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2709/files#diff-a9c3bd311eab80c9ebe6a69830f9ad02">app/assets/javascripts/application.js</a>
    (10)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2709/files#diff-bf43b4ee3000757ff301fb468531b6c6">app/assets/stylesheets/common.scss</a>
    (27)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2709/files#diff-83b4857029c08e77b677386927a44881">app/assets/stylesheets/small.scss</a>
    (64)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2709/files#diff-9c0beaca63c1fc3597ad03d826b4f02e">app/views/issues/show.html.erb</a>
    (4)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/2709.patch'>https://github.com/openstreetmap/openstreetmap-website/pull/2709.patch</a></li>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/2709.diff'>https://github.com/openstreetmap/openstreetmap-website/pull/2709.diff</a></li>
</ul>

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