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-control/styles/power-operations.scss b/app/server-control/styles/power-operations.scss
index cb2e190..3228fbd 100644
--- a/app/server-control/styles/power-operations.scss
+++ b/app/server-control/styles/power-operations.scss
@@ -31,6 +31,7 @@
   // Power bar indicator
   .power__indicator-bar {
     font-weight: bold;
+    width: 100%;
     padding: 1em 2em .7em;
     margin-bottom: 3em;
     background-size: 200% 100%;