https-ify sass-lang.com urls (#2608)

* https-ify sass-lang.com urls

See https://github.com/sass/sass-site/issues/217

Committed via https://github.com/asottile/all-repos

* Revert changes to vendored libsass

CODE_OF_CONDUCT.md

@@ -7,4 +7,4 @@ fair place to play.
 
 [The full community guidelines can be found on the Sass website.][link]
 
-[link]: http://sass-lang.com/community-guidelines
+[link]: https://sass-lang.com/community-guidelines

README.md

@@ -217,7 +217,7 @@ An array of paths that [LibSass] can look in to attempt to resolve your `@import
 * Type: `Boolean`
 * Default: `false`
 
-`true` values enable [Sass Indented Syntax](http://sass-lang.com/documentation/file.INDENTED_SYNTAX.html) for parsing the data string or file.
+`true` values enable [Sass Indented Syntax](https://sass-lang.com/documentation/file.INDENTED_SYNTAX.html) for parsing the data string or file.
 
 __Note:__ node-sass/libsass will compile a mixed library of scss and indented syntax (.sass) files with the Default setting (false) as long as .sass and .scss extensions are used in filenames.