Restructure Sass files

- Consolidate all bootstrap partials
- Combine all vendor overrides with BMC custom styles
- Updated paths for Vuepress docs

Signed-off-by: Yoshie Muranaka <yoshiemuranaka@gmail.com>
Change-Id: I1a9f68bdf90edae0d1e38f36ac670bf6426ec8a5
diff --git a/src/assets/styles/_helpers.scss b/src/assets/styles/_helpers.scss
index f01c00b..8c225ab 100644
--- a/src/assets/styles/_helpers.scss
+++ b/src/assets/styles/_helpers.scss
@@ -1,3 +1,3 @@
 // Import required for all single file components that use Sass variables
 @import "./bmc/helpers";
-@import "./vendor/bootstrap/helpers";
+@import "./bootstrap/helpers";