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-episodes.tpl.html

@@ -0,0 +1,15 @@
+<!--% query_episodes = 'SELECT
+        eps.id,
+        eps.explicit,
+        eps.date, eps.license, eps.title, eps.summary,
+        eps.duration, eps.notes, eps.tags,
+        hosts.hostid,
+        hosts.host, hosts.email, hosts.local_image,
+        miniseries.name AS series, miniseries.id AS seriesid
+    FROM eps
+        INNER JOIN hosts ON eps.hostid = hosts.hostid
+        INNER JOIN miniseries ON eps.series = miniseries.id
+        WHERE eps.date <= date(\'now\')
+        ORDER BY eps.id + 0 DESC'
+%-->
+