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/overview/styles/system-overview.scss b/app/overview/styles/system-overview.scss
index 0169480..01b7bc9 100644
--- a/app/overview/styles/system-overview.scss
+++ b/app/overview/styles/system-overview.scss
@@ -1,3 +1,7 @@
+.row {
+  width: 100%;
+}
+
 .overview__server-metadata {
   border-bottom: 1px solid $medgrey;
   padding: 1.8em 0 0 0;
@@ -46,4 +50,4 @@
   text-align: right;
   font-size: .8em;
   color: $darkgrey;
-}
\ No newline at end of file
+}