Fix http links to use https (mmistakes#2244)

Every site should support https by now. Better to link the https sites right away. Both sites do support https at the time I checked.

Author: d-Rickyy-b

_config.yml

@@ -215,7 +215,7 @@ kramdown:
 # Sass/SCSS
 sass:
   sass_dir: _sass
-  style: compressed # http://sass-lang.com/documentation/file.SASS_REFERENCE.html#output_style
+  style: compressed # https://sass-lang.com/documentation/file.SASS_REFERENCE.html#output_style
 
 
 # Outputting
@@ -272,7 +272,7 @@ tag_archive:
 
 
 # HTML Compression
-# - http://jch.penibelst.de/
+# - https://jch.penibelst.de/
 compress_html:
   clippings: all
   ignore: