fix(curriculum): remove SASS from requirements

curriculum/challenges/russian/03-front-end-libraries/sass/apply-a-style-until-a-condition-is-met-with-while.russian.md

@@ -1,9 +1,6 @@
 ---
 id: 587d7dbf367417b2b2512bbb
 title: Apply a Style Until a Condition is Met with @while
-required:
-  - src: 'https://cdnjs.cloudflare.com/ajax/libs/sass.js/0.10.9/sass.sync.min.js'
-    raw: true
 challengeType: 0
 videoUrl: ''
 localeTitle: 'Применить стиль до тех пор, пока условие не встретится с @while'

curriculum/challenges/russian/03-front-end-libraries/sass/create-reusable-css-with-mixins.russian.md

@@ -1,9 +1,6 @@
 ---
 id: 587d7dbd367417b2b2512bb6
 title: Create Reusable CSS with Mixins
-required:
-  - src: 'https://cdnjs.cloudflare.com/ajax/libs/sass.js/0.10.9/sass.sync.min.js'
-    raw: true
 challengeType: 0
 videoUrl: ''
 localeTitle: Создать многоразовый CSS с помощью Mixins

curriculum/challenges/russian/03-front-end-libraries/sass/extend-one-set-of-css-styles-to-another-element.russian.md

@@ -1,9 +1,6 @@
 ---
 id: 587d7fa5367417b2b2512bbd
 title: Extend One Set of CSS Styles to Another Element
-required:
-  - src: 'https://cdnjs.cloudflare.com/ajax/libs/sass.js/0.10.9/sass.sync.min.js'
-    raw: true
 challengeType: 0
 videoUrl: ''
 localeTitle: Расширение одного набора стилей CSS для другого элемента

curriculum/challenges/russian/03-front-end-libraries/sass/nest-css-with-sass.russian.md

@@ -1,9 +1,6 @@
 ---
 id: 587d7dbd367417b2b2512bb5
 title: Nest CSS with Sass
-required:
-  - src: 'https://cdnjs.cloudflare.com/ajax/libs/sass.js/0.10.9/sass.sync.min.js'
-    raw: true
 challengeType: 0
 videoUrl: ''
 localeTitle: Nest CSS с Sass

curriculum/challenges/russian/03-front-end-libraries/sass/split-your-styles-into-smaller-chunks-with-partials.russian.md

@@ -1,9 +1,6 @@
 ---
 id: 587d7dbf367417b2b2512bbc
 title: Split Your Styles into Smaller Chunks with Partials
-required:
-  - src: 'https://cdnjs.cloudflare.com/ajax/libs/sass.js/0.10.9/sass.sync.min.js'
-    raw: true
 challengeType: 0
 videoUrl: ''
 localeTitle: Разделите свои стили на мелкие куски с частицами

curriculum/challenges/russian/03-front-end-libraries/sass/store-data-with-sass-variables.russian.md

@@ -1,9 +1,6 @@
 ---
 id: 587d7dbd367417b2b2512bb4
 title: Store Data with Sass Variables
-required:
-  - src: 'https://cdnjs.cloudflare.com/ajax/libs/sass.js/0.10.9/sass.sync.min.js'
-    raw: true
 challengeType: 0
 videoUrl: ''
 localeTitle: Сохранять данные с помощью переменных Sass

curriculum/challenges/russian/03-front-end-libraries/sass/use-each-to-map-over-items-in-a-list.russian.md

@@ -1,9 +1,6 @@
 ---
 id: 587d7dbf367417b2b2512bba
 title: Use @each to Map Over Items in a List
-required:
-  - src: 'https://cdnjs.cloudflare.com/ajax/libs/sass.js/0.10.9/sass.sync.min.js'
-    raw: true
 challengeType: 0
 videoUrl: ''
 localeTitle: Использовать @each для сопоставления элементов в списке

curriculum/challenges/russian/03-front-end-libraries/sass/use-for-to-create-a-sass-loop.russian.md

@@ -1,9 +1,6 @@
 ---
 id: 587d7dbe367417b2b2512bb9
 title: Use @for to Create a Sass Loop
-required:
-  - src: 'https://cdnjs.cloudflare.com/ajax/libs/sass.js/0.10.9/sass.sync.min.js'
-    raw: true
 challengeType: 0
 videoUrl: ''
 localeTitle: Используйте @ для создания петли Sass

curriculum/challenges/russian/03-front-end-libraries/sass/use-if-and-else-to-add-logic-to-your-styles.russian.md

@@ -1,9 +1,6 @@
 ---
 id: 587d7dbe367417b2b2512bb8
 title: Use @if and @else to Add Logic To Your Styles
-required:
-  - src: 'https://cdnjs.cloudflare.com/ajax/libs/sass.js/0.10.9/sass.sync.min.js'
-    raw: true
 challengeType: 0
 videoUrl: ''
 localeTitle: 'Используйте @if и @else, чтобы добавить логику в свои стили.'