Move clinical/gene checkbox to the left

[rmoffitt]

[kaczmarj]

in our webgen meeting on october 29, we decided to put the checkboxes on the left. because we are using the materialize framework, we can use their grid feature (see https://materializecss.com/grid.html#grid-responsive). an example code that comes from there website and broadly does what we want...

    <div class="row">

      <div class="col s12 m4 l3">
        <!-- Checkboxes
              This content will be:
          3-columns-wide on large screens,
          4-columns-wide on medium screens,
          12-columns-wide on small screens  -->
      </div>

      <div class="col s12 m8 l9">
        <!-- Plots
              This content will be:
          9-columns-wide on large screens,
          8-columns-wide on medium screens,
          12-columns-wide on small screens  -->
      </div>

    </div>