Add alert message component and documentation

- Add custom alert component to simplify the use of custom alerts
- Add documentation for using the custom alert
- Update the login error alert to use the alert component instead of
the Bootstrap-vue component.
- Add the enhanceApp and bmcAppPlugin to extend vuepress to use both
the BMC custom and Boostrap-Vue components along with the custom styles

Signed-off-by: Derick Montague <derick.montague@ibm.com>
Change-Id: I5c0b696ca47ddba0df18041d6c5ee7509bf23572
diff --git a/docs/.vuepress/enhanceApp.js b/docs/.vuepress/enhanceApp.js
new file mode 100644
index 0000000..5a84f61
--- /dev/null
+++ b/docs/.vuepress/enhanceApp.js
@@ -0,0 +1,10 @@
+import {
+    AlertPlugin,
+  } from 'bootstrap-vue';
+
+import BmcAppPlugin from './bmcAppPlugin';
+
+export default ({ Vue }) => {
+      Vue.use(AlertPlugin);
+      Vue.use(BmcAppPlugin);
+}
\ No newline at end of file