added database crate, "settings" with migrations and queries, running migrations on web startup

crates/database/queries/settings/get.sql

@@ -0,0 +1,9 @@
+select id,
+       created_at as "created_at: DateTime<Utc>",
+       updated_at as "updated_at: DateTime<Utc>",
+       business_name,
+       business_logo
+
+from settings
+
+where id is 0

crates/database/queries/settings/init.sql

@@ -0,0 +1,2 @@
+insert or ignore into settings(id)
+values (0);

crates/database/queries/settings/set_business_logo.sql

@@ -0,0 +1,5 @@
+update settings
+
+set business_logo = ?
+
+where id is 0

crates/database/queries/settings/set_business_name.sql

@@ -0,0 +1,5 @@
+update settings
+
+set business_name = ?
+
+where id is 0