Extract feed_info struct and save routine to its own file

Also start creating basic framework for config

config.c

@@ -0,0 +1,11 @@
+#include <concord/discord.h>
+
+#include "config.h"
+
+struct zblock_config zblock_config;
+
+int zblock_config_load(struct discord *client) {
+	// TODO: actually load config
+	zblock_config.database_path = "feeds";
+	return 0;
+}