fix: change the default server port (#118)

Description

• change the default value of server port: 3000 to 2345 for Database Lab instances
• take into account the documentation (docs!69 (merged))

Related issue

#118 (closed)

Examples

server:
  verificationToken: "secret_token"
  port: 2345

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, specifications reflect those changes and they have been reviewed OR there are no API changes

Closes #118 (closed)