Create user management functionality (#152)

* Create user management page
* Remove old user creating UI
* Add username validation; admin user auto-creation
* Provide docs on user management
* Bump version

libs/ktem/flowsettings.py

@@ -12,6 +12,13 @@ user_cache_dir.mkdir(parents=True, exist_ok=True)
 
 COHERE_API_KEY = config("COHERE_API_KEY", default="")
 KH_MODE = "dev"
+KH_FEATURE_USER_MANAGEMENT = True
+KH_FEATURE_USER_MANAGEMENT_ADMIN = str(
+    config("KH_FEATURE_USER_MANAGEMENT_ADMIN", default="admin")
+)
+KH_FEATURE_USER_MANAGEMENT_PASSWORD = str(
+    config("KH_FEATURE_USER_MANAGEMENT_PASSWORD", default="XsdMbe8zKP8KdeE@")
+)
 KH_ENABLE_ALEMBIC = False
 KH_DATABASE = f"sqlite:///{user_cache_dir / 'sql.db'}"
 KH_DOCSTORE = {