mkdocs: update meta-information, set myself as maintainer

pkgs/development/tools/documentation/mkdocs/default.nix

@@ -1,4 +1,4 @@
-{ lib, python, fetchFromGitHub }:
+{ stdenv, lib, python, fetchFromGitHub }:
 
 with python.pkgs;
 
@@ -35,9 +35,18 @@ buildPythonApplication rec {
     backports_tempfile
   ];
 
-  meta = {
+  meta = with stdenv.lib; {
+    description = "Project documentation with Markdown / static website generator.";
+    longDescription = ''
+      MkDocs is a fast, simple and downright gorgeous static site generator that's
+      geared towards building project documentation. Documentation source files
+      are written in Markdown, and configured with a single YAML configuration file.
+      
+      MkDocs can also be used to generate general-purpose Websites.
+    '';
     homepage = http://mkdocs.org/;
-    description = "Project documentation with Markdown";
     license = lib.licenses.bsd2;
+    platforms = platforms.unix;
+    maintainers = [ maintainers.rkoe ];
   };
 }