Extract feed_info struct and save routine to its own file

Also start creating basic framework for config

config.h

@@ -0,0 +1,13 @@
+#ifndef ZBLOCK_CONFIG_H
+#define ZBLOCK_CONFIG_H
+
+#include <concord/discord.h>
+
+// the current zblock config
+extern struct zblock_config {
+	char *database_path;
+} zblock_config;
+
+int zblock_config_load(struct discord *client);
+
+#endif