Add ability to customize theme styles

Showcases how different themes/styles can be supported using
.env variables. If an environemnt name is specified during
the build process, an overrides file wil

Add ability to customize theme styles

Showcases how different themes/styles can be supported using
.env variables. If an environemnt name is specified during
the build process, an overrides file will be pulled in to
allow modifications to color and font definitions.

This commit includes possible style modifications with the openpower
env name as an example. To see the openpower changes, add the variable
definition VUE_APP_NAME="openpower" to your .env.development.local file
or build using 'npm run build -- --mode openpower'

- Moves helper imports into vue config to allow for
specific import order
- Removed helper imports in SFCs

Signed-off-by: Yoshie Muranaka <yoshiemuranaka@gmail.com>
Change-Id: Iaf7a59c24fda06a7b74e23f2f042fb3300cb2056

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