Enhancement about the benchmark site

Our benchmark site is available right now: https://shardingsphere.apache.org/benchmark/

Great progress has been made in presentation than the previous one.

We have reviewed the site and found several issues need to be resolved:

For text:

- [x] All **mysql** change to **MySQL**.

- [x] Modules can be **Sharding-JDBC/Sharding-Proxy** while can not be **sharding/sharding proxy/shardingproxy/sharding_proxy/sharding jdbc/shardingjdbc/sharding_jdbc**.

- [x] Explicit point out this(https://shardingsphere.apache.org/benchmark/#/mysql-vs-sharding) is a **loss test**.

- [x] There's no **VS** statement in:
https://shardingsphere.apache.org/benchmark/#/sharding-proxy-master-slave
https://shardingsphere.apache.org/benchmark/#/sharding-proxy-master-slave-sharding
https://shardingsphere.apache.org/benchmark/#/sharding-proxy-single-database-single-table
Compared with:
https://shardingsphere.apache.org/benchmark/#/shardingjdbc-vs-shardingproxy-encrypt
https://shardingsphere.apache.org/benchmark/#/shardingjdbc-vs-shardingproxy-sharding-encrypt
Please find a way to describe who vs who clearly.
Maybe we can remove VS for all cases are VS.

For data:

- [ ] The general order of the TPS in a compared performance is: MySQL > sharding-jdbc > sharding-proxy. But we can find several exceptions like the UPDATE case in https://shardingsphere.apache.org/benchmark/#/sharding-proxy-master-slave-sharding. I this case sharding-proxy > sharding-jdbc. We need to check the test environment and find the root cause. Of course, it does not meen there's no bugs in sharding-jdbc or sharding-proxy.

- [ ] For the case SELECT in https://shardingsphere.apache.org/benchmark/#/mysql-vs-sharding, the TPS of sharding-proxy is much lower than MySQL. We need to find out whether the case is reasonable or not. Or the performance of sharding-proxy need to be improved.

For cases:

- [x] There's no SELECT case in:
https://shardingsphere.apache.org/benchmark/#/sharding-proxy-master-slave

- [x] There're no SELECT and INSERT cases in:
https://shardingsphere.apache.org/benchmark/#/sharding-proxy-master-slave-sharding