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/package.json b/package.json
index 9cb77ce..1536539 100644
--- a/package.json
+++ b/package.json
@@ -38,7 +38,7 @@
     "angular-ui-router": "^1.0.20",
     "angular-websocket": "^2.0.1",
     "angularUtils": "git+https://github.com/michaelbromley/angularUtils.git#75dd112ff7b71b32f08743c2d0f29434f12dfa5c",
-    "bootstrap": "^3.3.7",
+    "bootstrap": "^4.1.3",
     "xterm": "^3.7.0"
   },
   "peerDependencies": {},