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/queries-ids-episode-sqlite.tpl.html

@@ -1,2 +0,0 @@
-<!--% query_ids_episode = 'select eps.id from eps order by eps.id' %-->
-