Docker improvements

[dsgnr]

• Fixes:

   => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 1)                                           0.0s
   => WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 11)                                          0.0s
  

• Fixes:

  WARN[0000] ~/portchecker.io/docker-compose-dev.yml: the attribute `version` is obsolete, it will be ignored, please. 
  remove it to avoid potential confusion
  

• Fixes an issue where webpack would raise command not found due to incorrect env path.

• Adds missing yarn.lock file to avoid incorrect package versions being installed.