fix(tutorial): remove optimize sass from step 5 (#3192)

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

src/pages/developing/react-tutorial/step-5.mdx

@@ -110,60 +110,6 @@ Before we get started,
 [create an IBM Cloud account](https://cloud.ibm.com/registration) if you don't
 already have one, as we'll be deploying there in a bit.
 
-## Optimize Sass
-
-So far we've been developing in a, well, development environment where static
-asset optimization hasn't been a priority. If you reference `/src/index.scss`,
-you'll see one `@import` that is pulling in Carbon's full Sass build.
-
-```scss path=src/index.scss
-$feature-flags: (
-  grid-columns-16: true,
-);
-
-@import 'carbon-components/scss/globals/scss/styles.scss';
-```
-
-To give you an idea of what's all included, open up
-`node_modules/carbon-components/scss/globals/scss/styles.scss`. You'll see
-imports for components like accordion, slider, tooltip, etc. Since we aren't
-using those components, let's exclude them from our built stylesheets. Keeping
-the `$feature-flags` Sass map, replace the `styles.scss` import with:
-
-```scss path=src/index.scss
-// Feature flags
-$css--font-face: true;
-$css--plex: true;
-
-// Global styles
-@import 'carbon-components/scss/globals/scss/css--font-face';
-@import 'carbon-components/scss/globals/grid/grid';
-
-// Carbon components
-@import 'carbon-components/scss/components/breadcrumb/breadcrumb';
-@import 'carbon-components/scss/components/button/button';
-@import 'carbon-components/scss/components/data-table/data-table';
-@import 'carbon-components/scss/components/link/link';
-@import 'carbon-components/scss/components/pagination/pagination';
-@import 'carbon-components/scss/components/tabs/tabs';
-@import 'carbon-components/scss/components/ui-shell/ui-shell';
-```
-
-In comparing to the included `carbon-components/scss/globals/scss/styles.scss`,
-you may be asking what happened to importing `_vars.scss`, `_colors.scss`,
-`_theme.scss`, etc.?
-
-Many of those global Sass partials get imported through the components. For
-example, open
-`node_modules/carbon-components/scss/components/button/_button.scss` to see its
-dependencies. No harm in importing them as
-`carbon-components/scss/globals/scss/styles.scss` does, but for simplicity here,
-we'll let the components pull them in.
-
-You can read more about optimizing Carbon's Sass in the
-[Carbon Design System publication](https://medium.com/carbondesign/minimal-css-with-carbon-b0c089ccfa71)
-on Medium.
-
 ## Build for production
 
 Before we deploy our app, we need to create an optimized production build with