chore: remove unnecessary primer.css conflicting with minima theme (#151)

Signed-off-by: tarilabs <[email protected]>

Author: tarilabs

_includes/custom-head.html

@@ -7,7 +7,7 @@
 
 
 {%- include favicons.html -%}
-<link href="https://unpkg.com/@primer/css/dist/primer.css" rel="stylesheet" />
+<!-- remove conflicting design language, especially for unvisited links: <link href="https://unpkg.com/@primer/css/dist/primer.css" rel="stylesheet" /> -->
 <link rel="stylesheet" href="//use.fontawesome.com/releases/v5.0.7/css/all.css">
 
 {%- if site.annotations -%}