Fix bad sample config.

Dependencies

• [2] MJDIMD5B Improve documentation of local docker-compose setup.
• [3] M3KUPGZK Add invitation email template.
• [4] 4B66XH43 Add sample billing config
• [*] QO4NFWIY Added sample config file.

Change contents

• replacement in conf/server/conf/aftok.cfg at line 31
  [3.12]→[3.12:31](∅→∅)
  − network = "test"
  [3.12]

  [2.2591]
  + networkMode = "test"