Update login page layout

This update will:

- Change the positioning of the form to be on the left
- Add the built on OpenBMC logo to the bottom right corner of the
screen
- Add the ability to include a GUI custom name using a .env variable.
If the variable is not present, the login page will not include the <h1>
section heading element.
- Remove the word "logo" from the alt attribute for the company logo
image used in the application header and on the login page.

Github story: https://github.com/openbmc/webui-vue/issues/63

Signed-off-by: Derick Montague <derick.montague@ibm.com>
Change-Id: I83ac5aecff0b3858c3ab5f38ab1aaa603d59acf1
diff --git a/tests/unit/__snapshots__/AppHeader.spec.js.snap b/tests/unit/__snapshots__/AppHeader.spec.js.snap
index b9e3bf7..1ad2b3d 100644
--- a/tests/unit/__snapshots__/AppHeader.spec.js.snap
+++ b/tests/unit/__snapshots__/AppHeader.spec.js.snap
@@ -54,7 +54,7 @@
           to="/"
         >
           <img
-            alt="undefined logo"
+            alt="Built on OpenBMC"
             class="header-logo"
             src="@/assets/images/logo-header.svg"
           />