fix: fix article regresssion (#250)

* refactor: output article element when needed

* refactor: refactor container styles and media queries

- Add the `$tablet` variable to `_container.scss`
- Add a media query to `_container.scss`
- Import `_container.scss` in `critical.scss`
- Remove the import of `_container.scss` in `style.scss`

assets/scss/critical.scss

@@ -9,3 +9,4 @@
 
 @import '_partial/nav';
 @import '_partial/article';
+@import '_partial/container';