chore: remove redundasnt doc

Author: ethe

guide/src/usage/tonbo.md

@@ -1,63 +1,5 @@
 # Tonbo API
 
-<!-- toc -->
-
-## Schema
-
-Tonbo provides ORM-like macro for ease of use, you can use `Record` macro to define schema of column family. Tonbo will generate all relevant code for you at compile time. For example, if you have a struct below
-
-```rust
-use tonbo::Record;
-
-#[derive(Record, Debug)]
-pub struct User {
-    #[record(primary_key)]
-    name: String,
-    email: Option<String>,
-    age: u8,
-}
-```
-
-tonbo will generate a struct `UserSchema` where you can get schema from. Other than `UserSchema`, tonbo will also generate a `UserRef` struct. You should notice that the records you get from tonbo are `UserRef` and all fields except primary key are `Option`.
-
-```rust
-#[derive(Debug, PartialEq, Eq, Clone, Copy)]
-pub struct UserRef<'r> {
-    pub name: &'r str,
-    pub email: Option<&'r str>,
-    pub age: Option<u8>,
-}
-```
-
-
-## Operations
-### Create Database
-
-You can use `DB::new(DbOption, Schema)` to create a database. `DbOption` is the configuration options for the database and `Schema` is the `xxxSchema` that tonbo generated.
-
-
-> **Note:** If you use tonbo in WASM, you should use `Path::from_opfs_path` rather than `Path::from_filesystem_path`.
->
-```rust
-use std::fs;
-use fusio::path::Path;
-use tonbo::{executor::tokio::TokioExecutor, DbOption, DB};
-
-#[tokio::main]
-async fn main() {
-    // make sure the path exists
-    fs::create_dir_all("./db_path/users").unwrap();
-
-    let options = DbOption::new(
-        Path::from_filesystem_path("./db_path/users").unwrap(),
-        &UserSchema,
-    );
-    let db = DB::<User, TokioExecutor>::new(options, TokioExecutor::current(), UserSchema)
-        .await
-        .unwrap();
-}
-```
-
 #### DbOption
 `DbOption` is a struct that contains configuration options for the database. Here are some configuration options you can set: