feat: change config paths for CLI, Joe server and Database Lab server (database-lab#151)

Description

Change config paths for CLI, Joe server and Database Lab server

Related issue

database-lab#151 (closed)

Examples

• Client CLI config: ~/.dblab/cli.conf
• Database Lab server: ~/.dblab/server.yml
• Joe server: ~/.dblab/joe.yml

Checklist

• the MR description has been reviewed
• this MR contains text changes and they have been reviewed OR there are no texts changes
• this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
• this MR contains API changes and they have been reviewed OR there are no API changes