Version 3.0.0.dev1

First pre-release of version3

• Introduce password inventory in mkdocs.yml or external yaml file, usable by level meta tag or _global #44.
  • Allow multiple passwords per page #36.
  • Allow username/password credentials
  • Deprecation of use_secret as environment variables can be read by !ENV in password inventory
• The password is now hashed by PBKDF2 instead of MD5 #47.
• Allow special characters to be used in passwords (passwords are URLencoded).
• Allow signing of generated pages and files
  • Check Ed25519 signatures with external canary script

Please test and report issues. Thanks.