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/styles/sensors.scss b/app/server-health/styles/sensors.scss
index fa44a46..a2246d7 100644
--- a/app/server-health/styles/sensors.scss
+++ b/app/server-health/styles/sensors.scss
@@ -51,6 +51,7 @@
 }
 
 .sensor__readings-row {
+  width: 100%;
   position: relative;
   display: block;
   margin: 0;
@@ -137,15 +138,9 @@
 
 #sensors, #sensors-overview {
 
-  .content__search {
-    max-width: 100%;
-    @media(min-width: 1300px) {
-      max-width: 59%;
-    }
-  }
   .toggle-filter {
     margin-right: 0;
   }
 }
 
-//end sensor details
\ No newline at end of file
+//end sensor details