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/ids-twat_episode.tpl.html

@@ -1,4 +1,4 @@
-<!--% USE DBI(constants.driver, constants.user, constants.password) %-->
+<!--% USE DBI(constants.driver) %-->
 <!--% FOREACH episode IN DBI.query(
 	'select eps.id from twat_eps AS eps'
 ) %-->