chore(docs): improve Bootstrap/BootstrapVue style import guide in "Getting started" docs (#6222)
chore(docs): improve Bootstrap/BootstrapVue style import guide in "Getting started" docs (#6222)

* Clarify custom, Bootstrap & BoostrapVue scss

The original version was a little confusing because it was repetitive and missed the opportunity to make clear at the outset that there are potentially 3 SCSS files and they must be imported in order.

* Update README.md

* Update README.md

* chore(docs) Ensure CSS and SCSS correctly used

Sorry! Thank you for updating. I have further clarified.

Hopefully it is OK now?

* Update README.md

* Update README.md

* Update README.md

Co-authored-by: Jacob Müller <7ae9a40946a993a46e3f1d4a8ac589d2efe9da89@gmail.com>
bootstrap-vue/bootstrap-vue,bootstrap-vue/bootstrap-vue