Reorganize repo into cargo workspace

blogdb/db/memory/migrations/20241014020038_init.sql

@@ -0,0 +1,10 @@
+CREATE TABLE IF NOT EXISTS pages (
+  slug STRING PRIMARY KEY UNIQUE NOT NULL,
+  content STRING NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS sessions (
+  id INTEGER PRIMARY KEY NOT NULL,
+  user STRING NOT NULL,
+  expires TEXT
+);