Added `GENERATE_PP` as a its own env option

[jocxfin]

Added:

• Added GENERATE_PP as a its own env option
• • Set this to true to automatically create passphrase instead of password

To use:

docker pull jocxfin/pwgen:latest
docker run -d -p 5069:5069 jocxfin/pwgen:latest

Offline mode:

docker pull jocxfin/pwgen:latest
docker run -d -e NO_API_CHECK=true -p 5069:5069 jocxfin/pwgen:latest

With environmental variables defining settings:

docker pull jocxfin/pwgen:latest
docker run -d -p 5069:5069 \\
  -e NO_API_CHECK=false \\
  -e PW_LENGTH=12 \\
  -e PW_INCLUDE_UPPERCASE=false \\
  -e PW_INCLUDE_DIGITS=false \\
  -e PW_INCLUDE_SPECIAL=false \\
  -e PW_EXCLUDE_HOMOGLYPHS=true \\
  -e PP_WORD_COUNT=4 \\
  -e PP_CAPITALIZE=false \\
  -e PP_SEPARATOR_TYPE=dash \\
  -e PP_USER_DEFINED_SEPARATOR='' \\
  -e PP_MAX_WORD_LENGTH=12 \\
  -e PP_INCLUDE_NUMBERS=false \\
  -e PP_INCLUDE_SPECIAL_CHARS=false \\
  -e PP_LANGUAGE=en \\
  -e PP_HIDE_LANG=false \\
  -e PP_LANGUAGE_CUSTOM='' \\
  -e MULTI_GEN=true \\
  -e GENERATE_PP=true \\
  jocxfin/pwgen:latest

Quick and straightforward improvements for a better tool.