Remove incorrect/unclear documentation

Author: maxstr

docs/documentation/overview/start.html

@@ -98,9 +98,6 @@ <h3 class="title">Customizing with Sass</h3>
         <p class="title is-5">
           <strong>Set</strong> your variables:<br>
 {% highlight sass %}
-// Import Bulma's initial variables
-@import "bulma/sass/utilities/variables.sass"
-
 // Override initial variables here
 // You can add new ones or update existing ones:
 
@@ -127,9 +124,6 @@ <h3 class="title">Customizing with Sass</h3>
         <p class="title is-5">
           <strong>Import</strong> Bulma <em>after</em> having set your variables:<br>
 {% highlight sass %}
-// Import Bulma's initial variables
-@import "bulma/sass/utilities/variables.sass"
-
 // Override initial variables here
 // You can add new ones or update existing ones: