Fixes broken link to Plugins docs on the homepage (#294)

* Fixes broken link to Plugins docs on the homepage

Fixes broken link to Plugins docs on the homepage

* Update way.pug

Author: epidemicz

src/way/way.pug

@@ -10,7 +10,7 @@ nav.way
       a.way_link( href="https://github.com/postcss/postcss#articles" )
         | Learn
     li.way_item
-      a.way_link( href="h/docs/postcss-plugins" )
+      a.way_link( href="/docs/postcss-plugins" )
         | Plugins
     li.way_item
       a.way_link( href="https://opencollective.com/postcss/" )