Remove MySQL specific code from site generation code

- site-generator is generic, so no changes.
 - removed mysql information from site.cfg.
 - Updated template files to call sqlite queries directly.
 - Renamed the query files - remove sqlite from file names.
 - Deleted MySQL specific template files.

templates/content-series.tpl.html

@@ -1,7 +1,7 @@
 <!--% PROCESS 'shared-utils.tpl.html' %-->
-<!--% PROCESS "queries-series-${constants.database}.tpl.html" %-->
+<!--% PROCESS "queries-series.tpl.html" %-->
   <article>
-<!--% USE DBI(constants.driver, constants.user, constants.password) %-->
+<!--% USE DBI(constants.driver) %-->
 <h1 class="title">In-Depth Series</h1>
 <!--% FOREACH series IN DBI.query(query_episodes) %-->
 	<h2><a href="<!--% absolute_path(baseurl) %-->series/<!--% zero_pad_left(series.id) %-->.html"><!--% series.name %--></a></h2>