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/configuration/styles/network.scss b/app/configuration/styles/network.scss
index d776d13..b194d0d 100644
--- a/app/configuration/styles/network.scss
+++ b/app/configuration/styles/network.scss
@@ -21,6 +21,7 @@
     padding-left: 1.8em;
   }
   .net-config__static-ip-wrap {
+    width: 100%;
     padding-left: 0;
     padding-top: 1em;
     display: block;