fc-list: add page

Fixes issue #978. I know that the format is not the right one, but I wanted to use the same style as in fc-match and fc-pattern.

pages/linux/fc-list.md

@@ -0,0 +1,7 @@
+# fc-list
+
+> List available fonts installed on the system.
+
+- Return a list of installed fonts with given name:
+
+`fc-list | grep '{{Font Name}}'`