Move to Bootstrap 4

Bootstrap < 4.1.2 has the following CVE:
https://nvd.nist.gov/vuln/detail/CVE-2018-14041

Removed bootstrap-theme.css due to "Replaced the separate optional
theme with configurable options via SCSS variables
(e.g., $enable-gradients: true)."

Added "width: 100%" to a few places where width 100% was no longer
getting inherited.
Moved a few elements and adjusted styles to get the same look as
before.

See https://getbootstrap.com/docs/4.0/migration/ for more
information.

Tested: Manually on a Witherspoon.
Change-Id: I0a72665ac1ca6eacd0b553a585b1fb15e14ae62c
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/app/server-health/controllers/sensors-overview-controller.html b/app/server-health/controllers/sensors-overview-controller.html
index 17030ba..5d510aa 100644
--- a/app/server-health/controllers/sensors-overview-controller.html
+++ b/app/server-health/controllers/sensors-overview-controller.html
@@ -19,8 +19,8 @@
         <button class="clear-input" ng-click="clear()">&#10005;</button>
         <input id="content__search-submit" type="submit" class="btn btn-primary content__search-submit" value="Filter" ng-click="doSearchOnClick()"/>
       </div>
+    </div>  <!-- end search -->
 
-    </div>
     <div class="toggle-filter">
       <p class="content-label">FILTER BY SEVERITY</p>
       <button class="inline first btn-primary" ng-click="toggleSeverityAll()"
@@ -37,7 +37,7 @@
       </button>
     </div>
 
-  </section> <!-- end search -->
+  </section>
 
   <section class="row column" ng-show="filteredSensorData.length == 0">
     <!-- message -->
@@ -69,4 +69,4 @@
       <p class="inline sensor__reading"><span class="sensor__label">High critical</span>{{sensor.CriticalHigh}}<span class="content-label">{{sensor.unit}}<span ng-if="sensor.unit == 'C'">&deg;</span></p>
     </div>
   </section>
-</div>
\ No newline at end of file
+</div>