Migrate to PostgresSQL

Lowe memory usage, better Chinese full-text search support.

New data structure

This release reduces memory cost for cloud deployments.

Web interface available

Now we provide a web inteface with 1,337,739 records of books indexed.

Improved prompt interface

We have 150644 indexes now.
We provide RediSearch binaries for Android this time, compiled in Termux.

Cli prompt interface

This is the first release, some bugs might exist. Please report them to me.
Pull-requests are welcome!